During the American Civil War, the Union Army, also known as the Federal Army and called the Northern Army, referred to the United States Army, the land force that fought to preserve the Union of the collective states. it proved essential to the preservation of the United States as a working, viable republic.

Union Army
U.S. flag (35 stars).svg
Flag of the United States from 1863 until 1865 (35 states/stars)
ActiveFebruary 28, 1861 – May 26, 1865
(4 years, 2 months and 4 weeks)
Country United States
Size2,128,948 total who served
Part ofU.S. Department of War
Colors  Dark Blue
March"Battle Hymn of the Republic"
See battles
Commander-in-ChiefPresident Abraham Lincoln (1861–1865)
President Andrew Johnson (1865)
Commanding GeneralMG Winfield Scott (1841–1861)
MG George B. McClellan (1861–1862)
MG Henry W. Halleck (1862–1864)
GA Ulysses S. Grant (1864–1869)
Union private infantry uniform

The Union Army was made up of the permanent regular army of the United States, but further fortified, augmented, and strengthened by the many temporary units of dedicated volunteers as well as including those who were drafted in to service as conscripts. To this end, the Union Army fought and ultimately triumphed over the efforts of the Confederate States Army in the American Civil War.

Over the course of the war, 2,128,948 men enlisted in the Union Army,[1] including 178,895 colored troops; 25% of the white men who served were foreign-born.[2] Of these soldiers, 596,670 were killed, wounded or went missing.[3] The initial call-up was for just three months, after which many of these men chose to reenlist for an additional three years.

Recruiting poster for the 1st Battalion New York Mounted Rifles


When the American Civil War began in April 1861, the U.S. Army consisted of ten regiments of infantry, four of artillery, two of cavalry, two of dragoons, and three of mounted infantry. The regiments were scattered widely. Of the 197 companies in the army, 179 occupied 79 isolated posts in the West, and the remaining 18 manned garrisons east of the Mississippi River, mostly along the Canada–United States border and on the Atlantic coast. There were only 16,367 men in the U.S. Army, including 1,108 commissioned officers. Approximately 20% of these officers — most of them Southerners — resigned, choosing to tie their lives and fortunes to the Army of the Confederacy.[4]

In addition, almost 200 West Point graduates who had previously left the Army, including Ulysses S. Grant, William Tecumseh Sherman, and Braxton Bragg, returned to service at the outbreak of the war. This group's loyalties were far more evenly divided, with 92 donning Confederate gray and 102 putting on the blue of the United States Army.

With the Southern slave states declaring secession from the United States, and with this drastic shortage of men in the army, President Abraham Lincoln called on the states to raise a force of 75,000 men for three months to put down this subversive insurrection. Lincoln's call forced the border states to choose sides, and four seceded, making the Confederacy eleven states strong. It turned out that the war itself proved to be much longer and far more extensive in scope and scale than anyone on either side, Union North or Confederate South, expected or even imagined at the outset on the date of July 22, 1861. That was the day that Congress initially approved and authorized subsidy to allow and support a volunteer army of up to 500,000 men to the cause.

The call for volunteers initially was easily met by patriotic Northerners, abolitionists, and even immigrants who enlisted for a steady income and meals. Over 10,000 German Americans in New York and Pennsylvania immediately responded to Lincoln's call, along with Northern French Americans, who were also quick to volunteer. As more men were needed, however, the number of volunteers fell and both money bounties and forced conscription had to be turned to. Many Southern Unionists would also fight for the Union Army. An estimated 100,000 white soldiers from states within the Confederacy served in Union Army units.[5] Between April 1861 and April 1865, at least 2,128,948 men served in the United States Army, of whom the majority were volunteers.

It is a misconception that the South held an advantage because of the large percentage of professional officers who resigned to join the Confederate army. At the start of the war, there were 824 graduates of the U.S. Military Academy on the active list; of these, 296 resigned or were dismissed, and 184 of those became Confederate officers. Of the approximately 900 West Point graduates who were then civilians, 400 returned to the United States Army and 99 to the Confederate. Therefore, the ratio of U.S. Army to Confederate professional officers was 642 to 283.[6] (One of the resigning officers was Robert E. Lee, who had initially been offered the assignment as commander of a field army to suppress the rebellion. Lee disapproved of secession, but refused to bear arms against his native state, Virginia, and resigned to accept the position as commander of Virginian C.S. forces. He eventually became the commander of the Confederate army.) The South did have the advantage of other military colleges, such as The Citadel and Virginia Military Institute, but they produced fewer officers. Though officers were able to resign, enlisted soldiers did not have this right. As they usually had to either desert or wait until their enlistment term was over in order to join the Confederate States Army; their total number is unknown.


General George B. McClellan with staff and dignitaries (from left to right): Gen. George W. Morell, Lt. Col. A.V. Colburn, Gen. McClellan, Lt. Col. N.B. Sweitzer, Prince de Joinville (son of King Louis Philippe of France), and on the very right – the prince's nephew, Count de Paris


President Abraham Lincoln exercised supreme command and control over the Army in his capacity as commander-in-chief of the United States Armed Forces. Below him was the Secretary of War, who oversaw the administration of the Army, and the General-in-Chief, who directed the field operations of the Army. At the start of the war, Simon Cameron served as Secretary of War before being replaced in January 1862 by Edwin Stanton. The role of General-in-Chief was filled by several men during the course of the war:[7]

The gap from March 11 to July 23, 1862, was filled with direct control of the army by President Lincoln and Secretary Stanton, with the help of an unofficial "War Board" that was established on March 17, 1862. The board consisted of Ethan A. Hitchcock, the chairman, with Department of War bureau chiefs Lorenzo Thomas, Montgomery C. Meigs, Joseph G. Totten, James W. Ripley, and Joseph P. Taylor.[8]

Reporting directly to the Secretary of War were the bureau chiefs or heads of staff departments which made up the Department of War. These included, at the onset of the war, the Adjutant General, Inspector General, Paymaster-General, Judge Advocate General, Chief of Engineers, Chief of Topographical Engineers, Quartermaster General, Commissary General of Subsistence, Chief of Ordnance, and Surgeon General.

After the war started, the position of Provost Marshal General was also created.[7] Originally established on September 24, 1862, as an office in the Adjutant General's department under Simeon Draper, it was made an independent department in its own right on May 1, 1863, under James B. Fry.[9] The Signal Corps was created and deployed for the first time, through the leadership of Albert J. Myer.

One drawback to this system was that the authority and responsibilities of the Secretary of War, his Assistant Secretaries, and the General-in-Chief were not clearly delineated. Additionally, the efforts of the four "supply" departments (Quartermaster, Subsistence, Ordnance & Medical) were not coordinated with each other, a condition that would last throughout the war. Although the "War Board" could provide military advice and help coordinate military policy, it was not until the appointment of Ulysses Grant as General-in-Chief was there more than the vaguest coordination of military strategy and logistics.[7]

Major organizationsEdit

The Union Army was composed of numerous organizations, which were generally organized geographically.

Military division
A collection of Departments reporting to one commander (e.g., Military Division of the Mississippi, Middle Military Division, Military Division of the James). Military Divisions were similar to the more modern term Theater; and were modeled close to, though not synonymous with, the existing theaters of war.
An organization that covered a defined region, including responsibilities for the Federal installations therein and for the field armies within their borders. Those named for states usually referred to Southern states that had been occupied. It was more common to name departments for rivers (such as Department of the Tennessee, Department of the Cumberland,) or regions (Department of the Pacific, Department of New England, Department of the East, Department of the West, Middle Department).
A territorial subdivision of a Department (e.g., District of Cairo, District of East Tennessee). There were also Subdistricts for smaller regions.
The fighting force that was usually, but not always, assigned to a District or Department but could operate over wider areas. An army could contain between one and eight corps, with an average of three.[10] Some of the most prominent armies were:

Each of these armies was usually commanded by a major general. Typically, the Department or District commander also had field command of the army of the same name, but some conflicts within the ranks occurred when this was not true, particularly when an army crossed a geographic boundary.

The commanding officer of an army was authorized a number of aide-de-camps as their personal staff and a general staff. It included representatives of the other combat arms, such as a chief of artillery and chief of cavalry (the infantry being typically represented by the commanding officer) and representatives of the staff bureaus and offices.[11] The staff department officers typically assigned to an army or military department included an Assistant Adjutant General, a Chief Quartermaster, a Chief Commissary of Subsistence, an Assistant Inspector General, an Ordnance Officer (all with the rank of Colonel) and a Medical Director.[12]

The 21st Michigan Infantry, a regiment serving in the Western Theater.
Washington, District of Columbia. Officers of 3d Regiment Massachusetts Heavy Artillery (1865)

Tactical organizationEdit


A corps was commanded by a major general and consisted of between two and six divisions, with an average of three, for approximately 36,000 men.[10][13] Corps had not existed in the United States Army prior to the Civil War, although the term was often used to refer to any large portion of an army. Corps were first legally authorized by an Act of 17 July 1862.[10] Initially, corps were designated in relationship to the army they operated under, i.e. I Corps, Army of the Potomac. Eventually the practice of numbering corps without reference to higher command was adopted.[14][15]

For a corps the number of staff officers authorized included an Assistant Adjutant General, a Quartermaster, an Assistant Inspector General, a Commissary of Subsistence, an Ordnance Officer (all of whom held the rank of Lieutenant Colonel) and a Medical Director.[12]


A division was the smallest "self-sufficient" unit of the Union Army. It was commanded by a major general and consisted of between two and five brigades for approximately 12,000 men.[10][13] On average an infantry division consisted of three brigades, while a cavalry division consisted of two.[10] Divisions were considered to be the Army's basic administrative and organizational unit during the Civil War. They were numbered sequentially within their corps but often referred to by the name of their commanding officer in official reports.[14][15]

The exact composition of a division varied during the course of the war. For example, in the Army of the Potomac a division was initially constructed around three infantry brigades, a cavalry regiment, and four batteries of artillery. After the Peninsula campaign the cavalry were removed to form their own brigades under army control, with each corps retaining a squadron for various duties, and after Joseph Hooker took command they were organized into a dedicated corps of three division, each with two brigades of cavalry and assigned horse artillery. Likewise the artillery were reorganized into their own brigades, first as an artillery reserve for the army until after Chancellorsville when they were placed under direct corps control.[15]

Staff officers authorized to a division included an Assistant Adjutant General, a Quartermaster, an Assistant Inspector General, a Commissary of Subsistence, an Ordnance Officer (all with the rank of Major) and a Surgeon.[12]


A brigade was commanded by a brigadier general and consisted of on average four regiments for approximately 4,000 men.[10][13] However, infantry brigades could contain as few as two or as many as twelve regiments, while cavalry brigades could have between two and eight regiments.[10] Because a system for replacing losses was practically non-existent, new regiments would simply be added to an existing brigade to bring its strength up to at least 2,000 men. While this could result in a mixture of veteran but smaller regiments grouped with larger novice regiments, it allowed the brigade to remain a consistently-sized unit that commanders could maneuver. Artillery was also organized into brigades but each contained only four to six batteries, were led by a Colonel and placed under the control of a parent corps. Early experiments at combined arms brigades were abandoned as the war progress, leaving brigades consisting of all just one type.[14]

Brigades were numbered based on their position within their parent division, but could also acquire nicknames even when this designation changed. Famous examples included the Iron Brigade and the Irish Brigade. Brigades also used distinctive identifying flags for the first time during the Civil War. An initial generic design was eventually replaced with a triangular flag which would have the symbol of their parent corps and be color-coded to designate brigade and division numbering within the corps.[14]

Staff officers authorized to a brigade included an Assistant Adjutant General, an Assistant Quartermaster/Ordnance Officer, an Assistant Commissary of Subsistence (all with the rank of Captain) and a Surgeon.[12]


The regiment was the fundamental unit of mustering, training and maneuvering in the Union Army. Commanded by a Colonel, an infantry regiment nominally consisted of ten companies for approximately 1,000 men.[10][13] However, attrition could reduce a regiment down to as few as 100 men.[10] Cavalry regiments typically consisted of four to six squadrons of two companies each, numbering between 660 and over 1,000 men.[10] An artillery regiment consisted of between eight and twelve batteries[16] and averaged 1,800 men.[10] Heavy artillery regiments were smaller with an average of 1,200 men in twelve batteries, but many were converted to infantry regiments rather than remain in garrison duty.[10]

Most logistical work was carried out at the regimental level, but unlike higher echelons the staff authorized to a regiment consisted of its own officers detailed to the position. The number of staff officers also depended on whether it was a Regular Army or Volunteer regiment and which combat arm to which it belonged. Regular infantry and cavalry regiments were authorized a regimental Adjutant, a Quartermaster/Commissary, an Ordnance Officer (all of Lieutenant rank), a Chaplain, and an Ordnance Sergeant. Regular artillery regiments were the same with the addition of a Commissary Sergeant, Quartermaster Sergeant, and Hospital Steward.[17] Volunteer infantry and artillery regiments were similar to Regular units but included, a quartermaster sergeant, a commissary sergeant, a hospital steward, a surgeon and two assistant surgeons. Volunteer cavalry regiments replaced one of the assistant surgeons with another hospital steward and added another lieutenant as regimental commissary, a saddler sergeant, and a chief farrier or blacksmith.[16]


An infantry battalion had no set definition in the United States Regular Army during the Civil War, only that every part of a regiment composed of two or more companies was designated a battalion.[10] Sometimes if a regiment only consisted of between four and eight companies it would be referred to as a battalion.[13] The cavalry equivalent was referred to as a Squadron and typically consisted to two companies.[10] Unlike the infantry, cavalry typically fought on the battlefield as squadrons.[14] However, there were no Volunteer battalions, and many Regular units would eventually abandon the concept.[16]

Staff officers authorized for an infantry battalion included an adjutant, quartermaster/commissary, quartermaster sergeant, commissary sergeant, and hospital steward. Cavalry squadrons included a saddler sergeant and veterinary sergeant.[17]


A company was traditionally the smallest military unit and typically organized and recruited in a local community.[10] Commanded by a Captain, an infantry company was approximately 100 men, with between 64 and 83 privates and 19 officers and other personnel. Companies were designated with a letter from A to K (minus J as it looked too much like I).[10][13] Companies could be subdivided into smaller units, including platoons, squads, sections and patrols.[10] Infantry companies were not authorized any logistical personnel until after 6 September 1862 when Volunteer units could include a wagoner.[16]

The cavalry equivalent was referred to as a Troop and could range from 79 and 105 men. Regular troops were authorized a company quartermaster sergeant, a saddler, two farriers and a wagoner; Volunteer troops added two teamsters and a commissary sergeant.[10][16] The artillery equivalent was a battery and consisted of between 80 156 men with between four and six artillery pieces. Both Regular and Volunteer units were authorized a quartermaster sergeant, a wagoner, and between two and six artificers.[10][16]


The champions of the Union – 1861 lithograph by Currier & Ives

Regulars vs VolunteersEdit

During the course of the Civil War, the vast majority of soldiers fighting to preserve the Union were in the Volunteer units. The pre-war Regular Army numbered approximately 16,400 soldiers, but by the end while the Union Army had grown sixty-two-fold to over a million men the number of Regular personnel was still approximately 21,699, a number of whom were serving with volunteer forces. Only 62,000 commissions and enlistments in total were issued for the Regular Army during the war as most new personnel preferred volunteer service.[18][19]

Since before the Civil War the American public had a general negative view of the nation's armed force, attributable to a Jeffersonian ideal which saw standing armies as a threat to democracy and instead valorized the "citizen soldier" as being more in keeping with American ideals of equality and rugged individualism.[20] This attitude remained unchanged during the Civil War, and afterwards many would attribute the Union's victory to the Volunteers rather than the leadership and staff work provided by the Regular Army.[21] In return, officers of the Regular Army despised the militia and saw them as having dubious value. Commentators such as Emory Upton would later argue that the reliance on militia for the nation's defense was responsible for prolonging conflicts and making them more expensive in both money and lives spent.[20][21]

Despite these attitudes towards the Regulars, they would serve as an important foundation around which the Union Army was built. In the disastrous First Battle of Bull Run, it was the Regulars who acted as rearguard during the retreat while the Volunteers fled, and when George McClellan was put in charge of what became the Army of the Potomac he used Regular officers and non-commissioned officers to train the Volunteers.[22] Training the Volunteers, especially in regards to critical administrative and logistical matters, remained an important function of the Regulars during the war.[23] This was particularly the case with Regular Army artillery, as they were more widely dispersed than the infantry and cavalry (making them more visible to the Volunteers) and were assigned to specific units to train their Volunteer counterparts.[24]

In battle, the Regulars' performance could impress even the most battle-hardened Volunteers.[25] At The Wheatfield during the Battle of Gettysburg, the Regulars' fighting skill and orderly retirement under fire drew the admiration of many observers, including Prince Philippe, Count of Paris. As one Volunteer put it, "For two years the U.S. Regulars taught us how to be soldiers [;] in the Wheatfield at Gettysburg, they taught us how to die like soldiers."[26] The Regulars became the standard by which the Volunteers were measured, and to be described as being as good or better than them was considered the highest compliment.[27]


Commissioned officers in the Union Army could be divided in several categories: general officers including Lieutenant General (added on March 2, 1864), Major Generals and Brigadier Generals; field officers including Colonels, Lieutenant Colonels and Majors; and company officers including Captains, First Lieutenants and Second Lieutenants. There was a further distinction between "line" officers - members of the artillery, cavalry or infantry branches - and staff officers, which were part of the various departments and bureaus of the War Department. All line officers outranked staff officers except in cases pertaining to their staff assignment, in which they received their orders from their respective department chiefs.[28] Additionally, Regular general officers outranked Volunteer general officers of the same grade regardless of their date of commission, a feature which could become a subject of contention.[29] The use of brevet ranks was also a common feature of the Union Army.

Officer appointments depended on the commission grade and whether it was in the Regular or Volunteer forces. The President reserved the right to issue commission for all Regular officers and for general officers in the Volunteer forces. Volunteer field and company-grade officers could be commissioned by either the President or their respective Governor. Company officers were also unique in that they were usually elected by members of their company.[28] The political appointment and/or election of Volunteer officers was part of a long-standing militia tradition and of a political patronage system common in the United States. While many of these officers were West Point graduates or had prior military experience, others had none, nor was military leadership a primary consideration in such appointments.[30] Such a policy inevitably resulted in the promotion of inept officers over more able commanders. As the war dragged on and casualties mounted, governors reacted to their constituents' complaints and instead began to issue commissions on the basis of battlefield rather than political competence.[31]

Officers tended to suffer a higher percentage of battle wounds on account of either the necessity of leading their units into combat an their conspicuousness when accompanied by staff and escorts.[32]

Among memorable field leaders of the army were Nathaniel Lyon (first Union general to be killed in battle during the war), William Rosecrans, George Henry Thomas and William Tecumseh Sherman. Others, of lesser competence, included Benjamin F. Butler.

Non-commissioned officers of the 93rd New York Volunteer Infantry Regiment

Non-commissioned OfficersEdit

Non-commissioned officers (NCOs) were important in the Union Army in maintaining the order and alignment of formations during marches, battles, and transitioning between the two. Sergeants in particular were vital in this role as general guides and their selection ideally reserved for the most distinguished soldiers. NCOs were also charged with training individuals in how to be soldiers. While the captain or other company-level officers were responsible for training the soldiers when assembled into squads, platoons or as a company, experienced NCOs could take over this training as well.[33] NCOs were also responsible for the regimental colors, which helped the unit maintain formation and serve as a rally point for the regiment. Typically a sergeant was designated the standard-bearer and protected by a color guard of corporals who only opened fire in defense of the colors.[34] There were a number of staff NCO positions including quartermaster sergeant, ordnance sergeant, and commissary sergeant.

NCOs in the Volunteer forces were quite different from their Regular counterparts as the war began. Appointed to their role as each regiment was created, they were often on a first-name basis with both their superior officers and the enlisted men they were tasked to lead. Discipline among friends and neighbors was not enforced as strictly as in the regular Army, and while some NCOs brought with them prior battlefield experience (whether from the Mexican-American War or foreign military service) many at the start of the war were as equally ignorant as their officers in military matters.[33][35] Training for these NCOs took place during off-duty hours and often involved lessons based on manuals such as Hardee's Tactics. One notable exception was Michigan, which designated Fort Wayne as a training center for both officers and NCOs. As the war progressed NCOs gained valuable experience and even drastic disciplinary measures such as execution by firing squad were carried out when deemed necessary. The promotion of soldiers to NCOs (and NCOs to officers) was also increasingly based on battlefield performance, although each state maintained their own standards for when and where promotions could be granted.[33][35]

Ethnic compositionEdit

The 26th U.S. Colored Volunteer Infantry on parade, Camp William Penn, Pennsylvania, 1865

The Union Army was composed of many different ethnic groups, including large numbers of immigrants. About 25% of the white men who served in the Union Army were foreign-born.[2] This means that about 1,600,000 enlistments were made by men who were born in the United States, including about 200,000 African Americans. About 200,000 enlistments were by men born in one of the German states (although this is somewhat speculative since anyone serving from a German family tended to be identified as German regardless of where they were actually born)[citation needed].[36] About 200,000 soldiers and sailors were born in Ireland. Although some soldiers came from as far away as Malta, Italy, India, and Russia, most of the remaining foreign-born soldiers came from Great Britain and Canada.

Twenty-year-old German immigrant John Haag of Company B, 26th Wisconsin Volunteer Infantry Regiment (August 1862)[37]
Breakdown of the approximately 2.2 million Union Enlistments signed:
Number Percent Origin
1,000,000 45.4 Native-born white Americans.
216,000 9.7 German-born
210,000 9.5 African-American. Half were freedmen who lived in the North, and half were ex-slaves from the South. They served under mainly white officers in more than 160 "colored" regiments and in Federal U.S. regiments organized as the United States Colored Troops (USCT).[38][39][40][41]
200,000 9.1 Irish-born
90,000 4.1 Dutch.
50,000 2.3 Canadian.[42]
50,000 2.3 Born in England.
40,000 1.8 French or French Canadian. About half were born in the United States of America, the other half in Quebec.[42]
20,000 0.9 Nordic, including Norwegian, Swedish (numbering roughly 3000),[43][44] Finnish, and Danish.
7,000 0.3 Italian
7,000 0.3 Jewish
6,000 0.2 Mexican
5,000 0.2 Polish (many of whom served in the Polish Legion of Brig. Gen. Włodzimierz Krzyżanowski)
4,000 0.1 Native Americans, mostly Lenape, Pamunkey, Lumbee, Seneca and Muscogee
295,000 6.4 Several hundred of other various nationalities

Many immigrant soldiers formed their own regiments, such as the Irish Brigade (69th New York, 63rd New York, 88th New York, 28th Massachusetts, 116th Pennsylvania); the Swiss Rifles (15th Missouri); the Gardes de Lafayette (55th New York); the Garibaldi Guard (39th New York); the Martinez Militia (1st New Mexico); the Polish Legion (58th New York); the German Rangers; Sigel Rifles (52nd New York, inheriting the 7th); the Cameron Highlanders (79th New York Volunteer Infantry); and the Scandinavian Regiment (15th Wisconsin). But for the most part, the foreign-born soldiers were scattered as individuals throughout units.[45]

For comparison, the Confederate Army was not very diverse: 91% of Confederate soldiers were native-born white men and only 9% were foreign-born white men, Irish being the largest group with others including Germans, French, Mexicans (though most of them simply happened to have been born when the Southwest was still part of Mexico), and British. Some Confederate propaganda condemned foreign-born soldiers in the Union Army, likening them to the hated Hessians of the American Revolution. Also, a relatively small number of Native Americans (Cherokee, Chickasaw, Choctaw, and Creek) fought for the Confederacy.

Black people in the Union ArmyEdit

Portrait of an African American Union soldier at Benton Barracks

By 1860, the African American or Black population of the United States consisted of four million enslaved and half a million free Blacks. When the Civil War started, many freedmen in the North attempted to enlist in Federal service but were barred from doing so. Popularly-held prejudices doubted whether Black people could be effective soldiers, and President Lincoln believed allowing their enlistment would anger Northern whites and alienate not just the South but the Border States too. However he eventually changed his mind and pressed Congress to authorize the first official Black enlistment system in late 1862, which eventually evolved into the United States Colored Troops.[46]

Before they were allowed to enlist, many Black people volunteered their services to the Union Army as cooks, nurses, and in other informal roles, and several Volunteer regiments of Black troops were raised by the states. These include the 1st Kansas Colored Infantry Regiment, the first Black regiment to be raised and the first to engage in combat; the 1st Louisiana Native Guard, raised from both freedmen and escaped slaves after the Capture of New Orleans; and the 54th Massachusetts Infantry Regiment, which became the most famous Black unit after their valiant participation in the Battle of Fort Wagner. Their efforts helped to dispel the notion that Black soldiers were a liability, allowing approximately 200,000 Black soldiers to serve in the Union Army during the Civil War.[46]

Even as they served their country, Black soldiers were subject to a number of discriminations. They were more often assigned to menial labor as some Union officers refused to employ them in combat, but when they were they often had to use inferior weapons and equipment. Black soldiers were paid less than white soldiers ($10 vs $16 per month) until Congress yielded to public pressure and approved equal pay in June 1864. Black units were led predominantly by white officers, and while more than a hundred Black men were eventually made officers (disregarding those passing as white), none were promoted to a rank higher than major. If captured by Confederate forces, Black soldiers risked being made slaves or summarily executed.[46]

Women in the Union ArmyEdit

Women took on many significant roles in the Union Army and were important to its ultimate success on the battlefield. The most direct way they could help was to enlist and fight as soldiers, although women were officially barred from doing so. Nevertheless, it is believed hundreds of women disguised themselves as men in order to enlist. While many were discovered and forced to quit, others were only found out after they were killed in combat, and a number managed serve throughout the entire war with their true identity successfully concealed.

Kady Brownell, a vivandière from Rhode Island

One of the more traditional roles played by women in the Union Army was that of camp followers. Thousands of white and Black women accompanied Union armies in an unofficial capacity to provide their services as cooks, laundresses, nurses and/or prostitutes. Many were the wives or other female relatives of the soldiers themselves who saw to their personal needs and (if time allowed) looked to the well-being of other soldiers. A somewhat more formal role for some camp followers was that of vivandière. Originally a female sutler, the role of vivandière expanded to include other responsibilities, including on the battlefield. Armed for their own protection, they brought water to thirsty soldiers, carried the regimental colors and rallied their fellow soldiers to fight, provided first aid or helped the wounded back to a field hospital. A related (and often conflated) role was that of "daughter of the regiment." Often literally a daughter of one of the regimental officers, these women looked to the soldiers' well-being but also served as their regiment's "mascot" who inspired the men by wearing stylish clothing and enduring the same hardships as them. Some of the most prominent women to accompany the Union armies in the field include Anna Etheridge, Susie King Taylor, and Nadine Turchin.[47][48][49]

Women also sought to serve more formally as nurses in the Union Army, many having been inspired by the work of Florence Nightingale during the Crimean War. However there was strong resistance against these efforts at first. Societal prejudices saw women as too delicate and the job too unsuitable for women of social rank, particularly at the thought of unmarried women surrounded by thousands of men in close quarters. Nevertheless, Congress eventually approved for women to serve as nurses, to which Dorothea Dix - appointed Superintendent of Army Nurses - was responsible for setting hiring guidelines and starting a training program for prospective candidates. For the women who served, nursing during the Civil War was a hazardous occupation: grueling hours spent in close proximity to deadly diseases and nearby battlefields resulted in many suffering permanent disabilities or death. Added to this were the prejudices of the male medical officers in charge who did not want them there and frequently clashed with the nurses over issues of triage, patient treatments and hospice care. Tens of thousands of women served as nurses for the Union Army, among whom are included Clara Barton, Mary Edwards Walker, and Louisa May Alcott.[50][51]

No less vital were the thousands of women who provided service to the Union Army in the field of espionage. Early in the war, women were at a distinct advantage as spies, scouts, smugglers, and saboteurs: the idea of women participating in such dangerous lines of work was simply not considered. Eventually though their opponents wised up to the fact of their existence, and while female spies caught in the act were not typically executed like their male colleagues, they still faced the threat of lengthy prison sentences. For self-evident reasons many of these activities were kept secret and any documentation (if it existed) was often destroyed. As such the identity of many of these women will never be known. Of those who became famous for their espionage work during or after the end of the war, prominent examples include Harriet Tubman, Mary Louvestre, Pauline Cushman, Elizabeth Van Lew and Mary Bowser.[52][53]


Anti-slavery sentimentEdit

In his 1997 book examining the motivations of the American Civil War's soldiers, For Cause and Comrades, historian James M. McPherson states that Union soldiers fought to preserve the United States, as well as to end slavery, stating that:

While restoration of the Union was the main goal for which they fought, they became convinced that this goal was unattainable without striking against slavery.

— James M. McPherson, For Cause and Comrades: Why Men Fought in the Civil War, (1997), p. 118, emphasis added.[54]

McPherson states that witnessing the slave system of the Confederacy first-hand also strengthened the anti-slavery views of Union soldiers,[54] who were appalled by its brutality.[54] He stated that "Experience in the South reinforced the antislavery sentiments of many soldiers."[54] One Pennsylvanian Union soldier spoke to a slave woman whose husband was whipped, and was appalled by what she had to tell him of slavery. He stated that "I thought I had hated slavery as much as possible before I came here, but here, where I can see some of its workings, I am more than ever convinced of the cruelty and inhumanity of the system."[54]

Army administration and issuesEdit

Adjutant General's DepartmentEdit

The responsibilities and functions of the Adjutant General's Department (AGD) were many and varied during the course of the Civil War, but principle among them was handling military correspondence between the President, Secretary of War and General-in-Chief, and the rest of the Army. Other functions included administering recruitment, overseeing the appointment of chaplains, maintaining personnel records, and issuing instruction books and other forms. During the war, some of the department's responsibilities and functions were spun off to new offices while new ones were added. The recruitment of new white Volunteers and draftees, and the suppression and punishment of absenteeism and desertion, was given to the newly-formed Provost Marshal General's Bureau in May 1863, while the position of Commissioner for the Exchange of Prisoners was created to take over this function from the AGD. The Bureau of Colored Troops was created within the AGD specifically to oversee the creation of the United States Colored Troops, and in the final year of the war the AGD was given the responsibility for collecting and editing documents which would constitute The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies.[55]

At the start of the Civil War, the AGD numbered just fourteen Regular Officers: the Adjutant General (AG) with the rank of colonel, a lieutenant-colonel, four brevet majors, and eight brevet captains. In August 1861 the AG was raised to major-general and the strength of the AGD increased to twenty officers, and a year later it was reorganized to constitute the AG, two colonels, four lieutenant-colonels, and thirteen majors. The small number of civilian clerical staff supporting the officers was also increased as the war progressed, including the addition of up to ten noncommissioned officers by 1862. However to meet the need for assistant adjutant generals authorized for each corps, division and brigade, appointments were made from among the Volunteer forces, and by 1865 there were an additional 85 majors and 256 captains serving in these capacities.[55]

In spite of the rapid increase of the Army at the start presenting numerous challenges and being perpetually understaffed throughout the war, the AGD appears to have handled its responsibilities competently and with little disruption. The AGD also had fewer conflicts with field commanders compared to some of the other departments, partly because its authority was well-established and issued few controversial orders itself, and it was less affected by matters of procurement and emerging technologies.[55]


Colonel Lorenzo Thomas was named Adjutant General of the army on March 7, 1861, one day after Col. Samuel Cooper resigned the join the Confederacy. While Thomas served as the AG throughout the entirety of the war, he eventually ran afoul of Secretary Stanton, who reassigned him to the job of recruiting soldiers for black regiments in the western theater. From March 1863 on then, the assistant adjutant general Colonel Edward D. Townsend essentially was the acting AG in Washington.[55]

Bureau of Refugees, Freedmen, and Abandoned LandsEdit

In March 1865 the Bureau of Refugees, Freedmen, and Abandoned Lands was created by Congress with a mandate to see to the needs of all Black freedmen and white refugees, and the management of all lands within the rebel states which had been abandoned or otherwise come into the possession of the United States. It consisted of a commissioner as head of the bureau, an assistant commissioner for each of the rebel states, and a small staff of one chief and nine other clerics. Additionally, any military officer could be assigned to duty on behalf of the bureau. Major General Oliver Otis Howard was appointed to head the bureau at its creation and lead it throughout its lifetime. While the Freedmen's Bureau was the center of much controversy during the Reconstruction era and some of the relief it provided less than satisfactory, its most important contribution was in providing education to many Blacks and poor whites.[56]

Corps of EngineersEdit

The Corps of Engineers was a small part of the Army prior to the Civil War but played an important role not only in the conflict but for the nation as a whole. The Corps was responsible for running the United States Military Academy at West Point, which supplied officers to all branches but whose top graduates were commissioned into the Corps. They were not only involved with military engineering such as constructing fortifications and harbor defenses but also oversaw civil engineering including building canals, bridges and similar projects. This focus on civil works did prevent the Corps from devoting its entire effort to the war though.[57][58] Corps personnel acted as combat engineers during battle, helping to construct pontoon bridges, repair roads and bridges, dig trenches, and conduct reconnaissance. The Corps also exerted an influence beyond its small size as many of the Union's most prominent officers, including McClellan and Meade, were themselves trained as engineers and used their knowledge to influence the outcome of battles.[57][59]

Prior to the war, the Corps of Engineers consisted of just forty-eight officers and a single company of 150 engineer troops. Engineer Company A was first created for the Mexican-American War and guarded President Lincoln at his first inauguration.[57][59] It was organized with ten sergeants (master-workmen), ten corporals (overseers), two musicians, sixty-four first-class privates (artificers) and sixty-four second-class privates (laborers).[60] In August 1861 Congress authorized the formation of three more companies to be organized the same as Engineer Company A, with all four organized into a single battalion (the US Engineer Battalion, later 1st Engineer Battalion), and the addition of two lieutenant colonels, four majors and six lieutenants to the Corps. The battalion had no formal headquarters but fell under the command of the most senior officer present. In March 1863, when the Corps of Topographical Engineers was disbanded and its function merged with the Corps of Engineers, Congress further revised the Corps to consist of a brigadier-general as chief engineer, four colonels, ten lieutenant-colonels, twenty majors, thirty captains, thirty first lieutenants and ten second lieutenants.[57][59]

The US Engineer Battalion served ably as part of the Army of the Potomac, but on its own was insufficient to see to the Army's need for engineers throughout the different theaters of war. A small number of Volunteer engineer regiments were formed during the war, including the 1st Michigan Engineers and Mechanics Regiment, the 1st New York Engineer Regiment and the 1st United States Veteran Volunteer Engineer Regiment. However in many cases engineering work was carried out by line soldiers under the supervision of officers with engineering backgrounds, if any were available.[57][59]


Corps of Topographical EngineersEdit

The Corps of Topographical Engineers had been established in 1831 with the mission of exploration, surveying, and cartography, particularly in the American West. Topographical engineers (or "topogs") including John C. Frémont, Howard Stansbury, William H. Emory and Gouverneur K. Warren were instrumental in the westward expansion of the United States.[61] During the war, the civilian nature of the Corps' mission was largely suspended and it undertook the role of reconnaissance, construction of defensive works and supplying maps to the Army. In these conditions drawing a distinction between the two corps became increasingly impractical, until in March 1863 the Corps of Topographical Engineers was disbanded and its mission taken up by the Corps of Engineers.[57]

The Topographical Engineers numbered forty-five officers before the Civil War. In August 1861 an additional two lieutenant colonels, four majors and six lieutenants were authorized by Congress. There were no enlisted men in the Corps, although when the Corps was expanded Congress also authorized a company of engineers for the Topographical Engineers to be modeled after the Corps of Engineers. However this company was never formed, and the actual size of the Corps shrank as a number retired, died, defected to the Confederacy or became general officers of the Volunteers, until eventually the remaining officers were absorbed by the Corps of Engineers.[57]

The most important role played by the Topographical Engineers, even after their merger with the regular Corps, was providing desperately-needed maps to Army commanders. Each field army headquarters established their own topographical departments under the supervision of engineer officers, which would provide the army with maps necessary for a given campaign. Such departments themselves were staffed with teams of draughtsmen and assistants and stocked with printing presses, photographic and lithographic equipment.[57]


The Chief of Topographical Engineers at the start of the Civil War was Colonel John James Abert. Colonel Abert had been responsible for lobbying Congress to make the Corps an independent branch of War Department and was appointed to lead his creation in 1838. He retired in September 1861 and was replaced by Stephen Harriman Long, who remained in the position until the Corps was disbanded. Thereafter he continued to serve in the Corps of Engineers as the senior officer to the Chief Engineer.[61][62]

Inspector General's DepartmentEdit

At the start of the Civil War, there was technically no Inspector General's Department, with neither a set of operating practices or centralized direction. Instead there were two Inspector Generals (IGs) with the rank of colonel whose duty was to conduct inspections and investigations to ensure the Army was organized and operating at full readiness, but these were done in an ad-hoc manner at the discretion of the Secretary of War. As the war progressed and membership in the inspectorate increased, the duties of IGs and assistant IGs were continually redefined, to the extent that any time a problem was identified the common response was simply to assign an inspector to it. Eventually in January 1863 a permanent office of the IG was established in Washington, and it was from here that the process of exerting a centralized control over IGs in the field and crafting standard policies and procedures was started.[63]

In August 1861, Congress authorized an increase of two additional IGs with the rank of colonel and five assistant IGs with the rank of major from among the Regular Army. This number stayed the same throughout the entire war, with the addition of a small civilian clerical staff once the Washington office was established. Congress eventually determined that each geographical department, army, corps, division and brigade would also be assigned an IG or assistant IG, however these positions were to be filled by Regular or Volunteer officers detailed from line units of the Army or from the other staff departments.[63]

The inspectorate faced many challenges during the Civil War, including hostility and lack of cooperation from some commanders and the mixed performance of some IGs in the field. Despite these issues it was able to successfully meet the challenges of the war overall, particularly with bringing under control the waste, fraud and abuse which had been rampant at the start of the conflict.[63]


At the start of the war the inspectorate consisted of Colonel Sylvester Churchill, the senior IG of the Army, and Colonel Joseph K. Mansfield, the junior IG. Churchill however took leave in April 1861 on account of his health and formally retired in September that year, while Mansfield was promoted to major-general and left to command troops in May. Colonel Henry L. Scott replaced Mansfield that same month, but when Churchill retired his position was given to Colonel Randolph Marcy, father-in-law to George McClellan, in the same month. Serving as the chief-of-staff to McClellan, Marcy did not formally take up his duties as senior IG until after the Battle of Antietam, by which point however his association with McClellan had soured Marcy's relationship with Secretary Stanton, who sent him on inspection tours of various geographical departments. Instead, the de facto leader of the inspectorate was whoever was the IG in charge of the Washington office, which was Colonel Delos Sacket between January 1863 and March 1864, and Colonel James Allen Hardie for the remainder of the war.[63]

Medical DepartmentEdit

The Army Medical Department (AMD) was rivaled only by the Quartermaster's Department in the scope and complexity of its responsibilities: caring for sick and wounded soldiers, operating field and general hospitals, and acquire and distributing medicine, medical equipment, hospital food and similar supplies. Functions such as evacuating soldiers off the battlefield or constructing hospitals were handled were handled by other departments, though later in the war the AMD assumed many of these roles. In March 1864 it was placed in charge of casualty evacuation (U.S. Ambulance Corps) and organization and operation of medical supply trains. In December it was given control over the construction and equipping of military hospitals, and of hospital trains and hospital ships in February 1865. Other responsibilities assumed during the war included care for disabled veterans and their families, prisoners of war, refugees and freed slaves; maintaining medical records of the dead and wounded; and preparing a medical and surgical history of the war. Unfortunately, the AMD started out the war staffed by a conservative and inflexible leadership which negatively impacted it's functioning, but would eventually be rectified by war's end.[64]

Position 1862 1863 1864 1865
Regular Army Medical Personnel[65]
Surgeon General (BG) 1 1 1 1
Assistant Surgeon General (COL) 1 1 1 1
Medical Inspector General (COL) 1 1 1 1
Medical Inspector (LTC) 8 16 16 16
Surgeon (MAJ) 50 50 50 50
Assistant Surgeon (CPT) 14 5 3
Assistant Surgeon (1LT) 100 109 111 114
Military Storekeeper 6 6 6 6
Medical Cadet 70 70 70 70
Hospital Steward 201 471 650 931

In April 1861 the AMD was the largest of the staff departments in the Regular Army: a Surgeon General (with the rank of Colonel), thirty surgeons, eighty-three assistant surgeons, and fifty-nine Hospital Stewards. However this number was barely adequate to meet the needs of the army in peacetime, and in May 1861 an additional ten surgeons and twenty assistant surgeons were added to cover the new Regular Army regiments being raised. Later that year in August, Congress authorized the appointment of fifty medical cadets to be chosen from young men with a liberal education and prior medical experience. They had the rank and pay of West Point cadets and were to act as ambulance attendants in the field and assistants in general hospitals.[66]

In April 1862, Congress authorized a substantial reorganization of the AMD. Beyond promoting the surgeon general to brigadier general and adding additional staff, one of the most controversial was the introduction of medical inspectors, as a number of these were appointed by Secretary Stanton for "political" purposes. Charged with supervising all aspects of sanitary conditions within the Army, their purview included the inspection of quarters, camps, hospitals and transports; their duties were later expanded to include issuing certificates of discharge for reasons of disability. Congress also gave the surgeon general the authority to hire as many hospital stewards as necessary, and a month later they authorized the addition of six trained apothecaries and druggists as medical storekeepers.[66]

Most Regular Army medical officers served in staff positions, whether at the office in Washington or out in the field as regimental surgeons, attending physicians in general hospitals, medical purveyors who ran medical supply depots and laboratories, or as the medical director of a division, corps, field army or military department. Medical directors oversaw the operation of field hospitals and the associate medical personnel, field sanitation and medical supply within their command. However there was no statutory basis for their assignment, and it wasn't until February 1865 when Congress bowed to pressure and provided for officers serving in these capacities to receive rank, pay and emoluments appropriate to their responsibilities.[66]

Added to the relatively small number of Regular Army medical personnel were a further 546 surgeons and assistant surgeons of US Volunteers, appointed by the president to supplement Regular Army personnel in staff positions; another 5,532 civilian doctors employed under contract (mainly in general hospitals) as acting assistant surgeons; a small number of medical officers of the Veteran Reserve Corps; and the thousands of regimental surgeons and assistant surgeons appointed to the Volunteer regiments by their respective state governors. Thousands more civilians were employed by the AMD as nurses, clerks, hospital attendants, laborers, etc. The AMD was further augmented by a number of private and semi-official philanthropic organizations, foremost among which was the United States Sanitary Commission (USCC).[66]

The chaotic aftermath of the first Battle of Bull Run - no coordination between field hospitals and casualty evacuation, regimental surgeons refusing to treat men from other units, and the few ambulance drivers robbing their charges or fleeing - exemplified the inadequacies of pre-war planning and preparations. Burdened with an aged and conservative leadership, it took the injection of more enlightened leaders to make the necessary reforms for the AMD to meet these new challenges. By the war's end, the AMD had implemented a better method of evacuating battlefield casualties to field hospitals and general hospitals, established laboratories to test and certify drugs and other medicines, identified reliable sources of supply and implemented effective contracting procedures, and increased the number of medical personnel necessary to see to the needs of over a million men under arms.[67]

Some challenges remained however, against which only small progress was made. Although improved field sanitation reduced disease rates and some advances like the use of chloroform proved helpful, lack of aseptic surgery or general understanding of the germ theory led to many deaths from disease, shock or secondary infection. Psychological trauma was not well understood and the average soldier made due with an inadequate diet for maintaining their health. The AMD's reliance on the Quartermaster and Subsistence departments for transportation and rations respectively left these subject to interdepartmental rivalry until late in the war, and personal conflict between military commanders and their supporting medical personnel could lead to problematic health outcomes. Despite these faults, AMD personnel did their best to alleviate the suffering of their fellow soldiers and laid the groundwork for future improvement.[67]


The Surgeon General at the start of the war was Colonel Thomas Lawson, who at 97 years was on his deathbed and his duties were being carried out Major Robert C. Wood, one of his assistants. When he passed in May 1861 Lawson was succeeded by Clement Finley, another old soldier who was characterized by contemporaries as "utterly ossified and useless." Finley was slow to act, failed to reform the AMD to address the needs of the war, and particularly opposed to the use of female nurses. He was forced to retire by Secretary Stanton in April 1862 and replaced with William A. Hammond, who immediately went about reorganizing the AMD, eliminating red tape and promoting competent young men to positions of authority. His strong independent streak also earned the enmity of Secretary Stanton, who in September 1863 sent him on an extended tour of the western theater and made Colonel Joseph Barnes the acting Surgeon General. When Hammond was arrested, court-martialed and dismissed in August 1864, Barnes was promoted to fill his position. Barnes remained the Surgeon General until after the war's end and succeeded in continuing Hammond's reforms by maintaining an excellent relationship with Secretary Stanton.[68]

Office of the Judge AdvocateEdit

An office of the Judge Advocate had existed in the US Army since its founding, consisting at the start of the Civil War of a single officer with the rank of major and small civilian clerical staff in Washington. It was not until after the war began however that Congress formally authorized the appointment of a Judge Advocate General (JAG) and creation of the Bureau of Military Justice, a de facto department and forerunner to a true Judge Advocate General's Department. The principle functions of the JAG included conducting courts-martial and inquiries; codifying the laws of war and the military laws of the United States; reviewing the records of courts-martial, military commissions and inquiries; and asserting the jurisdiction of military commissions over civilians in times of war.[69]

To meet the demands of a vastly larger army, Congress authorized in July 1862 the appointment of a JAG with the rank of colonel and for President Lincoln to appoint a judge advocate of Volunteers with the rank of major for each army in the field. These judge advocates were to advise commanders on legal issues, prosecute offenses, and review and maintain the records of courts-martial and other proceedings in the field. A year later, Congress legislated the creation of the Bureau of Military Justice, gave it an appellant function, and authorized the JAG to head it as a brigadier general alongside an assistant JAG with the rank of colonel. With these authorizations came a small increase in the size of the clerical staff assisting the JAG.[69]

During the war the JAG and his subordinates were able to satisfactorily handle the increase volume and complexity of legal matters that came with the exponential growth of the Army. Among their most important accomplishments was the creation of the Lieber Code and, for the first time, collecting all precedents, decisions and opinions which had become US military law into a single digest and publishing it in early 1865. One of the most controversial issues associated with the bureau was the use of military commissions to try civilians, an issue which would not be settled until Ex parte Milligan was decided in 1866.[69]


The Civil War began with brevet Major John F. Lee serving as the judge advocate of the Army until September 3, 1862, when Joseph Holt was formally appointed as JAG. Holt played an important parts in helping to expanding the office of the JAG and oversaw some of the most important and sensitive trials of the war. However Holt also made many enemies while JAG and was severely criticized for his handling of the trial of President Lincoln's assassins.[69]

Ordnance DepartmentEdit

The principal mission of the Ordnance Department (ORDD) during the Civil War was the development, procurement, storage, distribution and repair of all Army ordnance and ordnance-related equipment such as limbers and caissons and accoutrements. It was also responsible for the procurement of horses to pull artillery until June 1861 when the Quartermaster Department took over that job. The department faced challenges during the war, particularly during the early months as it struggled to arm the vastly expanded Union Army whilst traitorous forces seized control of a number of arsenals and depots. Eventually it was able to resolve many of these challenges and succeeded in providing thousands of field artillery pieces and millions of small arms for the Union Army.[70][71][72]

When the Civil War began the Ordnance Department was commanded by a Chief of Ordnance and authorized forty officers, many in command of the Army's arsenals and depots; fifteen ORDD military storekeepers; seventy ordnance sergeants, often placed in supervisory roles including command of some depots and arsenals; and four hundred enlisted men, most of whom were employed as technicians at the armories and arsenals. Hundreds of civilians were also employed, not only as clerks and laborers but also technicians and supervisors. There were also artificiers on the rolls of the Army's artillery regiments who were responsible for the maintenance of weapons within their regiments.[73]

Even in peacetime the size of the ORDD was insufficient, as fifty-six officers alone would've been required to bring the arsenals to their full authorized strength, and it proved inadequate once the war began. In August 1861 Congress increased the authorized number of officers to forty-five: the Chief of Ordnanced (brigadier general), two colonels, two lieutenant colonels, four majors, twelve captains, twelve first lieutenants, and twelve second lieutenants. This still was not enough, and so in March 1863 an additional lieutenant colonel, two majors, eight captains and eight first lieutenants were added, bringing the authorized strength to sixty-four officers where it would remain for the rest of the war. The number of ordnance sergeants and enlisted personnel were similarly increased on a yearly basis, until by 1865 they numbered 163 and 560 respectively, and the civilian staff was likewise increased.[73]

In the field, each regiment was authorized an ordnance officer (to be chosen from among the unit's lieutenants) who, assisted by an ordnance sergeant, saw to the requisition and issuing of arms to the troops and management of the regimental ammunition train. For brigades and higher echelons of command, an ordnance officer was authorized to serve on the unit's staff with similar responsibilities. However unlike with the other supply departments, the ordnance department did not commission any Volunteer officers to this role, instead relying on ORRD officers or (at division level and below) relying on Regular officers filling the role as acting ordnance officers or combining the role with the assigned quartermaster.[73]

The ORDD maintained a number of arsenals, armories and depots, where the majority of the Army's arms, ammunition and other ordnance-related supplies were manufactured and/or stored. A number were seized before or at the war's outbreak, but more were created after fighting began and existing ones were expanded. By the middle of the war, the largest arsenals employed between one and two thousand civilians each. A substantial number of these employees were women and children, partly because they could be paid less than adult male workers, their small hands were thought to be better suited to assembling cartridges, and women were believed to be more safety-oriented. Their line of work was dangerous for obvious reasons, and a number died in accidental explosions during the war. In the single-worst accident of the war, the explosion at the Allegheny Arsenal, 70 of the 78 victims were women and girls.[73]

Name Location Established Notes
United States Arsenals, Armories and Depots[70][74][75]
Springfield Armory Springfield, MA 1794 Principal US Army armory
Harpers Ferry Armory Harper's Ferry, VA 1796 Destroyed April 1861, seized by CSA
Allegheny Arsenal Pittsburgh, PA 1814
Watervliet Arsenal Watervliet, NY 1814
Champlain Arsenal Vergennes, VT 1816 Discontinued 1855, reestablished 1861
Frankford Arsenal Philadelphia, PA 1816
Rome Arsenal Rome, NY 1816
Bellona Arsenal Richmond, VA 1816 Discontinued 1835, seized by Virginia April 1861
Washington Arsenal Washington, D.C. 1816
Watertown Arsenal Watertown, MA 1816
Pikesville Arsenal Pikesville, MD 1819
Augusta Arsenal Augusta, GA 1826 Seized by Georgia militia January 1861
Baton Rouge Arsenal Baton Rouge, LA 1826 Seized by Louisiana militia January 1861
Kennebec Arsenal Augusta, ME 1827
St. Louis Arsenal St. Louis, MO 1827
Mount Vernon Arsenal Mount Vernon, AL 1829 Seized by Alabama militia January 1861
Detroit Arsenal Dearborn, MI 1832
Apalachicola Arsenal Apalachicola, FL 1833 Seized by Florida militia January 1861
New York Arsenal Governors Island, NY 1836
Fayetteville Arsenal Fayetteville, NC 1836 Seized by North Carolina militia April 1861
Little Rock Arsenal Little Rock, AR 1837 Seized by Arkansas authorities February 1861
Fort Monroe Arsenal Old Point Comfort, VA 1838
Charleston Arsenal Charleston, SC 1841 Seized by South Carolina militia December 1860
Leavenworth Arsenal Leavenworth, KS 1847
Benicia Arsenal Benicia, CA 1851
San Antonio Arsenal San Antonio, TX 1855 Seized by Texas militia February 1861
Vancouver Arsenal Fort Vancouver, WA 1859
Fort Union Arsenal Fort Union, NM 1860
Louisville Depot Louisville, KY 1861
Nashville Depot Nashville, TN 1862
Columbus Arsenal Columbus, OH 1863
Indianapolis Arsenal Indianapolis, IN 1863
Rock Island Arsenal Rock Island, IL 1863

The ORDD faced an immediate crisis when the war began as it was suddenly responsible for arming the rapidly-expanding number of troops being brought into Federal service. This job was made more difficult by actions taken by Secretary of War John B. Floyd before the war, when he ordered the transfer of large numbers of arms from Northern to Southern arsenals and the sale of Federal arms to various Southern states.[76] When the Southern states did seize the arsenals within their territory, in addition to the gun-making equipment at Harper's Ferry they were able to acquire about 159,000 small arms, 429 cannons, and 4.5 million rounds of small arms ammunition.[72] ORDD was forced to make up the immediate shortfall by contracting with private companies or purchasing from European powers; many weapons bought under contract proved to be inferior to government standards or sold at inflated prices, while European governments were happy to get rid of their obsolete weapons. Eventually the fraud and corruption was brought under control and ORDD was able to bring its arsenals' productions levels up to where they could meet the Army's need. This can be see with the rapid expansion of the Springfield Armory, which before the war averaged 800 muskets a month but by January 1863 was producing 24,000 muskets and rifles a month.[76]

A more persistent issue faced by ORDD were efforts by members of Congress, the general public, and even President Lincoln to get them to adopt many new military technologies, particularly breachloading and repeating rifles like the Spencer and Henry rifle. The department's senior leadership was unwilling to wholeheartedly embrace this technology without extensive field testing, and worried over delays from retooling manufacturing equipment and other logistical concerns that went with their adoption. Nevertheless a limited number of these weapons were purchased and distributed to troops in the field, and trials were undertaken to determine which one would become the Army's standard rifle for general use, although these weren't completed until well after the war ended.[76]

After the war ORDD came under harsh criticisms, particularly over their conservatism in regards to new technology. However it did meet the challenge of equipping the Union Army with many modern weapons and other materiel. From the beginning of the war to the end, Federal arsenals produced 7,892 cannons with over six million artillery shot and shell and six million pounds of grapeshot and canister shot; more than 4 million small arms with over a billion rounds of small arms ammunition; over 13,000 tons of gunpowder and 45,000 tons of lead; and nearly 3 million complete sets of infantry and cavalry accoutrements and horse equipment.[70][76]


Henry K. Craig was the Chief of Ordnance when the Civil War began, having served in that position since 1851. Craig received much of the blame for the poor state of affairs at the time, and angered many special interests by resisting the purchase of new and untested weapons in favor of increasing arsenal production and limiting purchases to reputable domestic and international sources. His obstinate behavior saw Craig relieved and replaced with James Wolfe Ripley on April 23, 1861. However Ripley was similarly resistant to these same private contractors and their Congressional backers, particularly with adopting breech-loading rifles, and so was forced to retire on September 15, 1863. His replacement, George D. Ramsay, was more open to the new weaponry but did not have the confidence of Secretary Stanton, who inserted Captain George T Balch into Ramsay's headquarters to "call the shots." Ramsay endured this situation until forced to retire on September 12, 1864. Alexander Brydie Dyer took over as Chief of Ordnance and served out the remainder of the war heading the department. While resistant to the lobbyists like his predecessors, Dyer was a more enthusiastic proponent of breech-loading and repeating rifles. He was also more bureaucratically adept and able to remain on good terms with Secretary Stanton.[77]

Pay DepartmentEdit

The Pay Department had the responsibility of accounting for, maintaining records regarding, and the disbursing of funds for payment to Army personnel, including allowances and bounties, as well as settling claims against the government related to pay and allowances. It was not however responsible for payments on contracts and other obligations incurred by the Army as those were handled by the respective department. Payments to officers and soldiers was supposed to be made on a bi-monthly basis, although circumstances might see these delayed significantly (as much as by eight months in some cases).[78]

As originally organized the Pay Department was headed by a paymaster general with the rank of colonel, two deputy paymasters general with the rank of lieutenant colonel, and twenty-five paymasters with the rank of major. There were also a small number of civilian clerks, but no enlisted personnel assigned to the department. Cash was received directly by the paymaster general from the Treasury Department and forwarded to the supervising paymaster of a given "pay district" or field headquarters. These funds were then distributed under armed guard to the officers and soldiers within the pay district. Pay districts generally coincided with the boundaries of military divisions, departments and districts, which as the Army grew the number and size of pay districts grew likewise. This required the appointment of more paymasters during the course of the war and an increase in the number of civilian clerks, the latter of which reached a peak of 155 by 1864.[78]

The rapid increase in the size of the Army presented a significant challenge to the Pay Department, as the number of soldiers needed to be paid was over fifty times greater than the pre-war size. This was particularly the case for sick and wounded soldiers who were separated from their units and so harder to located. However while payments were occasionally delayed, it never got to the point where soldiers felt compelled to mutiny as had been done during the Revolution. In the four years and four months of the Civil War, the Pay Department disbursed $1,029,239,000 of which $541,000 was lost due to embezzlements and other causes, at an expense of $6,429,600.[78]


When the Civil War began, Colonel Benjamin F. Larned served as Paymaster General but was in poor health. He was temporarily relieved of duty in July 1862 due to illness and would die a few months later. From July until December of that year, Major Cary H. Fry served as the acting Paymaster General, when Timothy Andrews was appointed to the position. He would remain in that position until retiring in November 1864, when Benjamin Brice was appointed in his place and finished out the war as Paymaster General. Both Andrews and Brice argued that the position of Paymaster General should made a brigadier general and the number and rank of subordinate paymasters similarly increased, commensurate with the type of expansion other administrative departments experienced during the war, but their recommendations were ignored.[78]

Provost Marshal General's BureauEdit

The Provost Marshal Genera's Bureau (PMGB) was created to oversee the apprehension of deserters, conduct counterespionage, and recover stolen government property. Originally established as an office of the AGD in September 1862, it was made an independent department in May 1863 as part of the Conscription Act of 3 March 1863. The Conscription Act also made it responsible for the administration of the draft system, with two other responsibilities added later that year: first with the management of the Invalid Corps in April, and then the recruitment of white volunteers in May. Intended only as temporary organization for the duration of the war the PMGB was effectively terminated in August 1866, whereupon all records, funds and responsibilities were transferred to the AGD.[9][79]

Initially consisting of a single officer, the provost marshal general (PMG) himself, eventually the bureau was authorized fourteen additional officers split between several branches. However, a mix of officers from the Regulars, Volunteers, and Invalid Corps were also detailed to the PMGB to fulfill a number of rolls. Each congressional district was appointed a provost marshal who served on a "board of enrollment." The board included two other persons (one of whom was to be a licensed physician) and was charged with overseeing the enrollment of men for the draft. An enrolling officer could also be appointed per subdistrict (town, township or ward) on a temporary basis, as could special agents tasked with apprehending deserters. Additionally, all provost marshals and special agents were empowered to arrest any stragglers and send them to the nearest military post. By November 1864 the PMGB (not counting the Invalid Corps) included 4,716 officers and employees.[79]

In the aggregate, the PMGB was successful in the enrollment and maintenance of sufficient manpower for the Union Army. Over one million men were brought into the Union Army at a cost of $9.84 per man (versus $34.01 per man prior to the bureau's formation) and the arrest and return to duty of over 76,500 deserters. The bureau was also able to raise $26 million to fully fund its enrollment and draft duties.[79]


When originally created as an office of the AGD, Colonel Simeon Draper was named the Provost Marshal General, which he held from October 1862 to March 1863. However, the PMGB did not live up to expectations under Draper's leadership. When it was made an independent department he was replaced with James Barnet Fry, who served as the PMG until the bureau's dissolution.[79]

Quartermaster-General's DepartmentEdit

Included the U.S. Military Telegraph Corps, United States Military Railroad and Cavalry Bureau.

  • Joseph E. Johnston: June 20, 1860 – April 22, 1861
  • Ebenezer S. Sibly (acting): April 22, 1861 – June 13, 1861
  • Montgomery C. Meigs: June 13, 1861 – February 6, 1882
    • Charles Thomas (acting): August 1, 1863 – January 8, 1864

Signal CorpsEdit

Subsistence DepartmentEdit

The mission of the Subsistence Department was the purchase, storage and distribution of rations and related items in a timely manner. It was the smallest of the four supply departments, and even as the army grew to encompass over a million soldiers the department itself barely expanded in size. Yet it was able to meet its mission to such an extent that President Lincoln once remarked to an officer "Your department we scarcely hear of; it is like a well-regulated stomach, works so smoothly we are not conscious of having it."[80]

The authorized strength of the department at the war's start was a Commissary General of Subsistence (CGS) with the rank of colonel, an assistant CGS with the rank of lieutenant colonel, and ten commissaries of subsistence (CS), two with the rank of major and the rest captains. Those not assigned to work at the office of the CGS in Washington were in charge of one of the subsistence depots or purchasing offices, or assigned to the staff of one of the military departments. Although there were no enlisted personnel in the department (all commissary positions at the regimental level being fulfilled by members of the regiment), a small civilian staff of clerks and laborers was assigned to the department.[80]

To meet the needs of feeding the rapidly-expanding Union Army, Congress authorized a CS with the rank of captain to be assigned to each brigade in July 1861, and in August 1861 the department was expanded with twelve additional officers, four majors and eight captains. A year later when army corps were officially created a CS with the rank of lieutenant colonel was authorized to serve on their staff, and in February 1863 the department was further expanded when the CGS was promoted to brigadier general, a second assistant CGS was added with the rank of colonel, and two additional majors were authorized. Eventually in March 1865 Congress formally recognized wartime requirements by authorizing a chief CS with the rank of colonel for each field army, military department and division, and principle subsistence depot; an assistant CS with the rank of colonel assigned to Washington; up to six CS with the rank of lieutenant colonel to serve as inspectors or special duty assignment; a chief CS with the rank of lieutenant colonel for each army corps; and a CS with the rank of major for each division.[80]

The need to fill CS positions among the field units primarily came from Volunteer officers or Regular officers detailed to the duty, and by the end of the war there were 535 commissaries of subsistence of Volunteers, bringing the total compliment of officers in the department to 564.[80] Although educating them in the principles of their duty was a constant problem, it was a minor one eventually fixed with time and experience, and those who couldn't meet the standards of the department were relieved of duty.[81]

During the war the principle subsistence depots and purchasing offices were located in Baltimore, Boston, Chicago, Cincinnati, Louisville, Philadelphia, St. Louis, San Francisco and Washington, D.C. Depot commissaries, assistant by civilian clerks and laborers, received purchases in bulk at these locations and repackaged them for shipment to armies in the field. The actual transportation of rations was handled by the Quartermaster Department, requiring close cooperation between the two. Major beef depots were also established in Alexandria (VA), Louisville and Washington. During the war the department developed a highly effective system of base, advanced, and temporary depots and mobile beef herds which followed behind Union forces in the field.[81][82]

The success of the Subsistence Department in meeting the challenges of the war was noted by Secretary Stanton, who observed in 1865 that no operation conducted by the Union Army failed on account of the department being unable to meet its obligations. In total, the department purchased over $361 million in foodstuff and miscellaneous subsistence items from July 1, 1861 to June 30, 1865. The vast quantities of items managed by the department included over 504 million pounds of hardtack, 223 million pounds of bacon, 200 million pounds of brown sugar, 106 million pounds of fresh beef, 64 million pounds of roasted coffee and more than 322,000 live beef cattle.[81]


At the start of the Civil War the CGS was George Gibson. Gibson, who at eighty-six was the older serving officer in the Army, had been in this position since the department was first created in April 1818 and as such was responsible for establishing its procurement and distribution methods. When he died on September 29, 1861, he was succeeded by his deputy, Joseph Pannell Taylor. Taylor oversaw the department's expansion during the most eventful years of its history and served until his death on June 29, 1864. The senior assistant CGS Amos Beebe Eaton was promoted to the position upon Taylor's death and served as CGS for the rest of the war.[80]

Military tacticsEdit

The Civil War drove many innovations in military tactics.[83] W. J. Hardee published the first revised infantry tactics for use with modern rifles in 1855. However, even these tactics proved ineffective in combat, as it involved massed volley fire, in which entire units (primarily regiments) would fire simultaneously. These tactics had not been tested before in actual combat, and the commanders of these units would post their soldiers at incredibly close range, compared to the range of the rifled musket, which led to very high mortality rates. In a sense, the weapons had evolved beyond the tactics, which would soon change as the war drew to a close.[84] Military railways, occasionally used in earlier wars, provided mass movement of troops. The electric telegraph was used by both sides, which enabled political and senior military leaders to pass orders to and receive reports from commanders in the field.[85]

There were many other innovations brought by necessity. Generals were forced to reexamine the offensive-minded tactics developed during the Mexican–American War where attackers could mass to within 100 yards of the defensive lines, the maximum effective range of smoothbore muskets. Attackers would have to endure one volley of inaccurate smoothbore musket fire before they could close with the defenders. But by the Civil War, the smoothbores had been replaced with rifled muskets, using the quick loadable minié ball, with accurate ranges up to 900 yards. Defense now dominated the battlefield. Now attackers, whether advancing in ordered lines or by rushes, were subjected to three or four aimed volleys before they could get among the defenders. This made offensive tactics that were successful only 20 years before nearly obsolete.[86]

Desertions and draft riotsEdit

Desertion was a major problem for both sides. The daily hardships of war, forced marches, thirst, suffocating heat, disease, delay in pay, solicitude for family, impatience at the monotony and futility of inactive service, panic on the eve of battle, the sense of war-weariness, the lack of confidence in commanders, and the discouragement of defeat (especially early on for the Union Army), all tended to lower the morale of the Union Army and to increase desertion.[87][88]

In 1861 and 1862, the war was going badly for the Union Army and there were, by some counts, 180,000 desertions. In 1863 and 1864, the bitterest two years of the war, the Union Army suffered over 200 desertions every day, for a total of 150,000 desertions during those two years. This puts the total number of desertions from the Union Army during the four years of the war at nearly 350,000. Using these numbers, 15% of Union soldiers deserted during the war. Official numbers put the number of deserters from the Union Army at 200,000 for the entire war, or about 8% of Union Army soldiers. Since desertion is defined as being AWOL for 30 or more days and some soldiers returned within that time period, as well as some deserters being labeled missing-in-action or vice versa, accurate counts are difficult to determine. Many historians estimate the "real" desertion rate in the Union Army as between 9–12%.[89] About 1 out of 3 deserters returned to their regiments, either voluntarily or after being arrested and being sent back. Many deserters were professional "bounty jumpers" who would enlist to collect the cash bonus and then desert to do the same elsewhere. If not caught and executed, this crime could pay well.[90][91]

Rioters attacking a building during the New York anti-draft riots of 1863

Irish immigrants were the main participants in the famous "New York Draft riots" of 1863.[92] Stirred up by the instigating rhetoric of Democratic politicians,[93] the Irish had shown the strongest support for Southern aims prior to the start of the war and had long opposed abolitionism and the free black population, regarding them as competition for jobs and blaming them for driving down wages. Alleging that the war was merely an upper-class abolitionist war to free slaves who might move north and compete for jobs and housing, the poorer classes did not welcome a draft, especially one from which a richer man could buy an exemption. The poor formed clubs that would buy exemptions for their unlucky members. As a result of the Enrollment Act, rioting began in several Northern cities, the most heavily hit being New York City. A mob reported as consisting principally of Irish immigrants rioted in the summer of 1863, with the worst violence occurring in July during the Battle of Gettysburg. The mob set fire to African American churches and the Colored Orphan Asylum as well as the homes of prominent Protestant abolitionists. A mob was reportedly repulsed from the offices of the staunchly pro-Union New York Tribune by workers firing two Gatling guns. The principal victims of the rioting were African Americans and activists in the anti-slavery movement. Not until victory was achieved at Gettysburg could the Union Army be sent in; some units had to open fire to quell the violence and stop the rioters. Casualties were estimated as up to 1,000 killed or wounded.[94] There were a few small scale draft riots in rural areas of the Midwest and in the coal regions of Pennsylvania.[95][96]

See alsoEdit


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  3. ^ Civil War Casualties
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  15. ^ a b c Wilson, p. 12-15
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  29. ^ Eicher, p. 34
  30. ^ Staff Ride Handbook for the Battle of Perryville, 8 October 1862. (2005). Fort Leavenworth, KS: Combat Studies Institute, US Army Command and General Staff College. p. 3-6
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  36. ^ Sanitary Commission Report, 1869[clarification needed]
  37. ^ Chippewa County, Wisconsin Past and Present, Volume II. Chicago: S.J. Clarke Publishing Company, 1913. p. 258.
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  40. ^ "General Orders No. 14". Civil War on the Western Border: The Missouri-Kansas Conflict, 1855–1865. Kansas City: The Kansas City Public Library. Archived from the original on November 5, 2014. Retrieved November 5, 2014. [V]ery few blacks serve in the Confederate armed forces, as compared to hundreds of thousands who serve for the Union.
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  93. ^ McPherson, James M. (1996). Drawn with the Sword: Reflections on the American Civil War. New York: Oxford University Press, Inc. pp. 91–92. ISBN 978-0-19-509679-8. Rioters were mostly Irish Catholic immigrants and their children. They mainly attacked the members of New York's small black population. For a year, Democratic leaders had been telling their Irish-American constituents that the wicked 'Black Republicans' were waging the war to free the slaves who would come north and take away the jobs of Irish workers. The use of black stevedores as scabs in a recent strike by Irish dockworkers made this charge seem plausible. The prospect of being drafted to fight to free the slaves made the Irish even more receptive to demogogic rhetoric.
  94. ^ Iver Bernstein, The New York City Draft Riots: Their Significance for American Society and Politics in the Age of the Civil War (1990)
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  96. ^ Kenneth H. Wheeler, "Local Autonomy and Civil War Draft Resistance: Holmes County, Ohio." Civil War History. v.45#2 1999. pp 147+ online edition


  • Eicher, John H., and David J. Eicher. Civil War High Commands. Stanford, CA: Stanford University Press, 2001. ISBN 0-8047-3641-3.
  • Grant, Ulysses S. Personal Memoirs of U.S. Grant. 2 vols. Charles L. Webster & Company, 1885–86. ISBN 0-914427-67-9.
  • Glatthaar, Joseph T. Forged in Battle: The Civil War Alliance of Black Soldiers and White Officers. New York: Free Press, 1990. ISBN 978-0-02-911815-3.
  • Hattaway, Herman, and Archer Jones. How the North Won: A Military History of the Civil War. Urbana: University of Illinois Press, 1983. ISBN 0-252-00918-5.
  • McPherson, James M. What They Fought For, 1861–1865. Baton Rouge: Louisiana State University Press, 1994. ISBN 978-0-8071-1904-4.
  • McGrath, John J. The Brigade: A History, Its Organization and Employment in the US Army. Fort Leavenworth, KS: Combat Studies Institute, US Army Command and General Staff College, 2004. ISBN 9781428910225
  • Shrader, C. R., Newell, C. R. (2011). Of Duty Well and Faithfully Done: A History of the Regular Army in the Civil War. University of Nebraska, 2011.
  • Wilson, J. B. (1998). Maneuver and Firepower: The Evolution of Divisions and Separate Brigades. Washington, DC: Center of Military History, U.S. Army, 1998.

Further readingEdit

  • Bledsoe, Andrew S. Citizen-Officers: The Union and Confederate Volunteer Junior Officer Corps in the American Civil War. Baton Rouge, Louisiana: Louisiana State University Press, 2015. ISBN 978-0-8071-6070-1.
  • Canfield, Daniel T. "Opportunity Lost: Combined Operations and the Development of Union Military Strategy, April 1861 – April 1862." Journal of Military History 79.3 (2015).
  • Kahn, Matthew E., and Dora L. Costa. "Cowards and Heroes: Group Loyalty in the American Civil War." Quarterly journal of economics 2 (2003): 519–548. online version
  • Nevins, Allan. The War for the Union. Vol. 1, The Improvised War 1861–1862. The War for the Union. Vol. 2, War Becomes Revolution 1862–1863. Vol. 3, The Organized War 1863–1864. Vol. 4, The Organized War to Victory 1864–1865. (Charles Scribner's Sons, 1960–71. ISBN 1-56852-299-1.)
  • Prokopowicz, Gerald J. All for the Regiment: the Army of the Ohio, 1861–1862 (UNC Press, 2014). online
  • Shannon, Fred A. The Organization and Administration of the Union Army 1861–1865. 2 vols. Gloucester, MA: P. Smith, 1965. OCLC 428886. First published 1928 by A.H. Clark Co.
  • Welcher, Frank J. The Union Army, 1861–1865 Organization and Operations. Vol. 1, The Eastern Theater. Bloomington: Indiana University Press, 1989. ISBN 0-253-36453-1; . The Union Army, 1861–1865 Organization and Operations. Vol. 2, The Western Theater. (1993). ISBN 0-253-36454-X.

External linksEdit