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The Tank, Infantry, Mk IV (A22) Churchill was a British heavy infantry tank used in the Second World War, best known for its heavy armour, large longitudinal chassis with all-around tracks with multiple bogies, its ability to climb steep slopes, and its use as the basis of many specialist vehicles. It was one of the heaviest Allied tanks of the war.
|Tank, Infantry, Mk IV Churchill|
|Place of origin||Great Britain|
|In service||1941–1952 (British Empire)[note 1]|
|Wars||World War II, Korean War|
|Manufacturer||Vauxhall Motors and others|
|No. built||5,640 approx.|
|Length||24 ft 5 in (7.44 m)|
|Width||10 ft 8 in (3.25 m)|
|Height||8 ft 2 in (2.49 m)|
|Crew||5 (commander, gunner, loader/radio operator, driver, co-driver/hull gunner)|
|Engine||Bedford 12-cylinder, 4 stroke, water-cooled, horizontally opposed, L-head petrol engine|
350 hp (261 kW) at 2,200 rpm
|Power/weight||9.1 hp (6.7 kW) / tonne|
|Transmission||Merritt-Brown 4-speed constant-mesh epicyclic gearbox|
|56 miles (90 km)|
|Maximum speed||15 mph (24 km/h)|
|Triple differential steering in gearbox|
The origins of the Churchill's design lay in the expectation that war in Europe might well be fought in conditions similar to those of the First World War, and thus emphasised the ability to cross difficult ground. The Churchill was hurried into production in order to build up British defences against a possible German invasion. The first vehicles had flaws that had to be overcome before the Churchill was accepted for wide use. After several Marks (versions) had been built, a better-armoured specification, the Mark VII, entered service with the British Army. The improved versions performed well in the later stages of the war.
The Churchill was used by British and other Commonwealth forces during the North African, Italian and North-West Europe campaigns. In addition, 344 Churchills were sent as military aid to the Soviet Union during the Second World War and more than 250 saw active service on the Eastern Front.
The Churchill tank was named after Prime Minister Winston Churchill, who had promoted the development of the tank in the First World War. Churchill told Field Marshal Jan Smuts "That is the tank they named after me when they found out it was no damn good!"
The name only incidentally matched what became the British Army practice of giving service names beginning with C to tanks. Cruiser tanks were given names, such as the contemporary Covenanter, Crusader, Cromwell, Cavalier and Comet but infantry tank naming had no particular pattern. Post-war, the merging of the cruiser and infantry tank lines in the 'universal' or main battle tanks continued with C names: Centurion, Conqueror, Chieftain, and Challenger.
Initially specified just before the outbreak of the Second World War, the A20 (its General Staff specification) was to be supplement the Matilda II and Valentine infantry tanks. In accordance with British infantry tank doctrine and based on the expected needs of attacking a fixed defensive line, crossing wide trenches, possibly shell-cratered ground similar to First World trench warfare it was to be immune to the current German 3.7 cm Pak 36 anti-tank guns and carry an unditching beam.
A general outline produced by Woolwich Arsenal was expanded by Belfast shipbuilders Harland and Wolff with advice from the Department of Tank Design. The General Staff had proposed that it was armed with two QF 2 pounder guns, each located in a side sponson with a coaxial Besa machine gun. A third Besa and a smoke projector would be fitted in the front hull. To reduce weight the specification was revised to prefer a maximum armour to the front of 60 mm - sufficient to protect against ordinary shells from the German 37 mm gun. Outline drawings were produced by Woolwich Arsenal based on the A12 Matilda turret - the Director of Mechanisation opposed a turretless design - and the engine and Wilson epicyclic transmission being developed for the A13 Mark III Covenanter tank. Detail design and construction of the A20 was left to Harland and Wolff, who completed four prototypes by June 1940. During the construction period, the armament was reconsidered, including fitting either a 6-pounder gun or the French short 75 mm gun (as used on Char B1) in the forward hull - the former was considered too long[note 2] and the latter would require redesigning the front of the hull. In the end, a 3-inch howitzer was chosen. The A20 designs were short-lived, however, as at roughly the same time the defeated British Expeditionary Force was evacuated from Dunkirk. While intended for "positional warfare" and direct assaults against fortifications (it was referred to as "Shelled Area Tank", or by the French phrase Char de Fortresse) which had been rendered pointless by the fast pace of German armoured warfare a heavy tank that could defend the infantry from other tanks was still desired.
At an initial 32 tons, with a 300 hp flat-12 Meadows DAV engine, the A20 had limited power compared to the 16-ton Covenanter. This was a less serious limitation than it might appear, owing to the British distinction between the high-speed cruiser tanks and the slow-speed infantry tanks. Vauxhall, who were already involved as consultants on the suspension, were approached to see if they could build the A20 and one example was sent to Vauxhall at Luton to see if they could provide an alternative engine developing 350 bhp. To this end, they developed a flat-12 petrol engine. For speed of production, this engine was based on a Bedford Vehicles (Vauxhalls commercial vehicle operations) six-cylinder lorry engine, giving rise to its name of "Twin-Six". Although using sidevalves to fit within the space, the engine was developed with high squish pistons, dual ignition and sodium-cooled exhaust valves in Stellite seats to give 350 bhp.
With France lost, the scenario of trench warfare in Northern Europe was no longer applicable and the design was revised by Dr Henry Merritt,[note 3] Director of Tank Design at Woolwich Arsenal, based on the combat witnessed in Poland and France. These new specifications, for the A22 or Infantry Tank Mark IV, were given to Vauxhall in June 1940.
With a German invasion of Britain looking imminent, and the loss of a substantial amount of military vehicles in the evacuation from France, the War Office specified that the A22 had to enter production within a year. By July 1940, the design was completed and by December of that year the first prototypes were completed; in June 1941, almost exactly a year as specified, the first Churchill tanks began rolling off the production line.
A leaflet from the manufacturer was added to the User Handbook, which also described known faults, with work-arounds and what was being done to correct the problem. It said:
Fighting vehicles are urgently required, and instructions have been received to proceed with the vehicle as it is rather than hold up production. All those things which we know are not as they should be will be put right.
Harold Drew of Vauxhall achieved miracles with the Churchill and its Merrit-Brown Tank Gearbox produced by David Brown Ltd.; "a brilliant design that went into production off the drawing board without adequate prototype testing and had the most disastrous teething troubles" according to Robotham, but British tanks were under-powered, under-gunned and unreliable. At the Tank Board level the Director of Artillery was still extolling the merits of the 2-pounder, and this gun was still fitted to every British tank until March 1942.[note 4] In a 1942 exercise one tank had to have its gearbox changed five times.
Because of its hasty development, there had been little testing and the Churchill was plagued with mechanical faults. Most apparent was that the Churchill's engine was underpowered, unreliable, and difficult to access for servicing. Another serious shortcoming was the tank's inadequate armament, the 2 pounder (40 mm) gun, which was improved by the addition of a 3-inch howitzer in the hull to deliver a HE shell, albeit not on a howitzer's usual high trajectory.
Production of a turret to carry the QF 6 pounder gun began in 1941, but lack of supplies of the plate used in an all-welded design led to an alternative cast turret also being produced. These formed the distinction between Mark III and Mark IV.
The poor speed of the Churchill nearly caused production to be ceased in favour of the forthcoming Cromwell tank; it was saved by the successful use of the Mk III at the Second Battle of El Alamein in October 1942.
The second major improved Churchill, the Mk VII, was first used in the Battle of Normandy in 1944. The Mk VII improved on the already heavy armour of the Churchill with a wider chassis and the British 75 mm gun, which had been introduced on the Mk VI. It was primarily this variant, the A22F, which served through the remainder of war. It was re-designated A42 in 1945.
The Churchill was a versatile project and was used in numerous specialist roles.
The hull was made up of simple flat plates, which were bolted together in earlier models and were welded in later models. The hull was split into four compartments: the driver's position at the front, then the fighting compartment including the turret, the engine compartment, and the gearbox compartment. The suspension was fitted under the two large "panniers" on either side of the hull, the track running over the top. There were eleven bogies either side, each carrying two 10-inch wheels. Only nine of the bogies normally took the vehicle weight, the front coming into play when the vehicle nosed into the ground or against an obstacle, the rear acting in part as a track tensioner. Due to the number of wheels, the tank could survive losing several without much in the way of adverse effects as well as traversing steeper terrain obstacles. As the tracks ran around the panniers, escape hatches in the side could be incorporated into the design. These were retained throughout the revisions of the Churchill and were of particular use when the Churchill was adopted as the AVRE.
The Bedford Vehicles engine was effectively two engines in horizontally opposed configuration ("flat twelve") on a common crankshaft. There were four Solex carburettors each on a separate manifold that fed three cylinders formed as a single cylinder head. The elements of the engine and ancillary components were laid out so they could be reached for maintenance through the engine deck covers. Air for the engine was drawn from the fighting compartment through air cleaners. Cooling air was drawn into the engine compartment through louvres on the sides, across the radiators and through the engine compartment by a fan driven by the clutch. This fan blew the air over the gearbox and out the rear of the hull. By opening a flap between the fighting compartment and the engine compartment, this airflow could be used to remove fumes produced by firing the armament. The 1,296 cu in (21.238 L) capacity engine was rated at 350 bhp at 2,000 rpm, delivering 960 lb⋅ft (1,300 N⋅m) torque over an engine speed range from 800 to 1,600 rpm.
The gearbox featured a regenerative steering system that was controlled by a tiller bar instead of the more commonplace brake levers or, as with the German Tiger I heavy tank, a steering wheel. The tiller was connected, with servo assistance, hydraulically to the steering brakes. The Churchill was also the first tank to utilise the Merritt-Brown triple differential gearbox, which allowed the tank to be steered by changing the relative speeds of the two tracks; this effect became more pronounced with each lower gear, ultimately allowing the tank to perform a "neutral turn" when no gear was engaged, where it could fully pivot within its own length and thus rotate in place. There were final reduction gears, of the planetary type, in the driving wheels. Although capable of 17 mph (27 km/h) the noise at that speed was so great that the Churchill was limited to 10 to 12 mph (16 to 19 km/h) by not using the highest gear.
The first turrets were of cast construction and were rounded in shape, providing sufficient space to accommodate the relatively small 2 pounder gun. To fulfil its role as an infantry support vehicle, the first models were equipped with a 3-inch howitzer in the hull in a layout very similar to the French Char B1. This enabled the tank to deliver a useful high-explosive capability while retaining the anti-tank capabilities of the 2 pounder. However, like other multi-gun tanks, it was limited by a poor fire arc - the track horns limiting traverse - and elevation of only 9°. Despite the length of the gun the muzzle velocity was only 600 ft/s (180 m/s) .[note 5] The Mark IVA (retrospectively the Churchill Mk II) dispensed with the howitzer (there had been only enough guns to equip 300 tanks) and replaced it with a bow machine gun and on the Mk III, the 2 pounder was replaced with the 6 pounder, significantly increasing the tank's anti-tank capabilities. The tank underwent field modification in North Africa with several Churchills being fitted with the 75 mm gun of destroyed M4 Shermans. These "NA75" variants were used in Italy. The use of the 75 mm increased the effectiveness of the tank, as it was a generally superior weapon to the 6 pounder, possessing similar anti-tank capabilities, while also being considerably more effective when used in infantry support roles.
Churchills made use of the Vickers Tank Periscope MK.IV. In the Mark VII, the driver had two periscopes as well as a vision port in the hull front that could be opened. The hull gunner had a single periscope as well as the sighting telescope on the BESA machine gun mounting. In the turret, the gunner and loader each had single periscope and the commander had two fitted in his hatch cupola.
The armour on the Churchill, often considered its most important feature, was originally specified to a minimum of 16 millimetres (0.63 in) and a maximum of 102 millimetres (4.0 in); this was increased with the Mk VII to a range from 25 millimetres (0.98 in) to 152 millimetres (6.0 in). Though this armour was considerably thicker than its rivals (including the German Tiger I tank, but not the Tiger II) it was not sloped, reducing its effectiveness. Earlier models were given extra armour by the expedient of welding on extra plates.
On the Mark VII, the hull front armour was made up of a lower angled piece of 5.5 in (140 mm), a nearly horizontal 2.25 in (57 mm) plate and a vertical 6 inch plate. The hull sides, were, for the most part, 3.75 in (95 mm). The rear was 2 in (51 mm) and the hull top 0.525 in (13.3 mm). The turret of the Mark VII was 6 in (150 mm) to the front and 3.75 in (95 mm) for the other sides. The turret roof was 0.79 (20 mm) thick. Plate was specified as IT 80, the cast sections as IT 90.
The A22F, also known as "Heavy Churchill", was a major revision of the design. The most significant part was the use of welding instead of riveted construction. Welding had been considered earlier for the Churchill but, until its future was assured, this was no more than testing techniques and hulls at the firing ranges. What welding reduced in the overall weight (estimates were around 4%), the thicker armour of the A22F made up for. Welding also required fewer man-hours in construction. The hull doors changed from square to round which reduced stresses. A new turret went with the new hull. The sides, which included a flared base to protect the turret ring, were a single casting while the roof, which did not need to be so thick, was a plate fitted to the top.
Since the engines on the Churchill were never upgraded, the tank became increasingly slow as additional armour and armament was equipped and weight increased; while the Mk I weighed 40 long tons (41,000 kg) and the Mk III weighed 39 long tons (39,630 kg), the Mk VII weighed 40 long tons (40,640 kg). This caused a reduction in the tanks' maximum speed from its original 26 km/h (16 mph) down to 20.4 km/h (12.7 mph).
Another problem was the tank's relatively small turret that prevented the use of powerful weapons; definitive versions of the tank were armed with either the QF 6-pounder or the derivative QF 75 mm gun. The 6-pounder was effective against armoured vehicles, but less so against other targets; the 75 mm was a better all-round weapon, but lacked in effectiveness against armour. Although the Churchills with their 6-pounders could outgun many contemporary German medium tanks (like the Panzer IV with the short-barrel 75 mm gun, and the Panzer III armed with the 50 mm gun) and the thick armour of all Churchill models could usually withstand several hits from any German anti-tank gun, in the later years of the war the German Panther tank had a 75 mm high-velocity cannon as its main armament along with increased protection, against which the Churchills' own guns often lacked sufficient armour penetration to fight back effectively.
The Churchill had many variations, including many specialised modifications. The most significant change to the Churchill was that it was up-gunned from 2-pounder to 6-pounder and then 75 mm guns over the course of the war. By the war's end, the late model Churchill Mk VII had exceptional amounts of armour – considerably more than the German Tiger tank. However, the firepower weakness was never fully addressed. The Mark VII turret that was designed for the 75 mm gun was of composite construction – cast with top and bottom plates welded into position.
While it had weaknesses, the Churchill could cross terrain obstacles that most other tanks of its era could not. This capacity frequently proved useful, especially during the fighting in Normandy. One action in Normandy where the tank's ability to surmount obstacles was found to be of value was the capture of Hill 309 on 30/31 July 1944 (Operation Bluecoat) conducted by VIII Corps.
The Churchill tank was produced with Vauxhall as the design parent. Subcontracted work on some tanks was provided by Whessoe Foundry & Engineering, Metropolitan‑Cammell Carriage & Wagon, Babcock & Wilcox, Newton, Chambers & Co. and the Gloucester Railway Carriage & Wagon Company produced some complete vehicles. Other contractors produced hulls and turrets which went to Vauxhall, Charles Roberts & Co., and Dennis Brothers for final assembly.
|Churchill III||late 1942||675 or 692|
|Churchill IV||1943||(together with Churchill V) 1,622|
|Churchill V||1943||(together with Churchill IV) 241|
|Churchill VI||early 1944||(improved Churchill IV) 200|
|Churchill VII||1944||(together with Churchill VIII) 1,400|
|Churchill VIII||1944||(together with Churchill VII) 200|
In March and April 1942, Vauxhall stopped producing new tanks. Together with Broom & Wade (at High Wycombe) they started rebuilding earlier tanks; about 700 of the first 1,000 built were included in this scheme. The reworked tanks got an "R" as a suffix to their WD number. Changes to the hull air intakes and the full length mudguards were the most obvious changes.
Turrets for the earliest Marks were single piece castings. One thousand were supplied from the United States: 600 complete from General Steel and 400 from American Steel Foundries that were finished by other companies before shipping to UK.
The Churchill first saw combat on 19 August 1942, in the Dieppe Raid in France. The Dieppe raid was planned to temporarily take control of the French port of Dieppe using a strong force of about 6,000 troops – mostly drawn from inexperienced Canadian units. The operation, codenamed Jubilee, would test the feasibility of opposed landings. Nearly 60 Churchill tanks from the 14th (Reserve) Army Tank Regiment, (The Calgary Regiment (Tank)),[note 6] were allocated to support the infantry and commandos; they would be put ashore by Landing Craft Tank vessels, along with the supporting engineers. Some problems were anticipated and allowed for: waterproofing of the hulls, canvas carpets ("Bobbin") to aid the tanks crossing the short stretch of shingle beach, engineer teams to demolish road blocks and a few of the tanks were fitted with flame-throwers. The tanks, a mix of Mark I with hull howitzers, Mark II (three with flamethrowers) and Mark III (some with Bobbin), were expected to enter the town and reach a nearby airfield before retiring back to the beach to be taken off by the LCTs. Half of the tank force would be held in reserve offshore.
In the event, the German defences were stronger than expected. The beach was "chert" which included larger stones than the anticipated shingle: according to history professor Hugh Henry, the German defenders had previously considered it impassable to tanks. Only the 30 Churchills in the first two waves of 10 LCTs were landed on the beach under heavy fire: the latter two waves were turned away. One Churchill was trapped in its LCT by shellfire. Of the 29 remaining (eight Mark I/IIs, three Oke flamethrower tanks, and 18 Mark IIIs), two sank en route to shore, and 11 were immobilized on the beach due to a combination of the chert shingle and indirect fire. Only 15 would get off the beach and over the sea wall onto the Dieppe promenade. Although these tanks were effective in engaging the defenders in the town's buildings, their further progress was blocked by concrete defences; the engineer demolition teams – killed or pinned on the beach – had not been able to accompany the tanks. Ten of these Churchills were able to return to the beach once the withdrawal had been signalled but they could not be evacuated. According to Henry, no Churchills were penetrated by German anti-tank fire while still manned. These surviving tank crews fought to cover the withdrawal of the infantry from the beach, and almost all were captured with their vehicles, having exhausted their main gun ammunition. The tank regiment's commanding officer, Lieutenant-Colonel Johnny Andrews, was among those killed in action. Nearly 70% of the Canadians were killed, injured or captured and none of the raid's objectives were met other than the secret raid on the radar station on a headland.
Two Mark II had been sent to North Africa for trials and they were joined by six Mk III Churchills (with the 6 pounder) to form the Special Tank Squadron commanded by Major Norris King. They saw action in the Second Battle of El Alamein in October 1942. This detachment, called "Kingforce", supported the attack of 7th Motor Brigade first with three tanks at Kidney Ridge (where one was hit "repeatedly" by anti-tank gun fire (including "friendly fire" from a British gun) and another took "a lot of punishment"), then the remaining five at Tell-el-Aqqaqir. The Churchills were fired on many times by Italian and German anti-tank guns, but only one was knocked out and partially caught on fire. One tank was said to have been hit up to 80 times.
Kingforce, formed to test whether the Churchills could operate in Africa, was considered too slow to participate in the chase after the retreating Axis, sent back to Alexandria and disbanded after El Alamein. The 25th Army Tank Brigade of three regiments was sent to Africa, and went into action in February 1943 during the Tunisian campaign.[note 7] It was followed by 21st Army Tank Brigade.
Churchill tanks took part in containing the German offensive of Operation Ochsenkopf in February – March 1943. At a place called Steamroller Farm, two Churchill Mk III tanks of 51 RTR got ahead of their squadron. They came across an entire German transport column, which they ambushed and completely shot up before they rejoined. The end result was the destruction of two 88 mm, two 75 mm and two 50 mm, four lesser anti-tank guns, 25 wheeled vehicles, two 3-inch mortars, two Panzer III tanks and infliction of nearly 200 casualties.
A Churchill tank in a hull down defensive position made a particular contribution to Allied success. In one encounter, on 21 April 1943, during the start of the Battle of Longstop Hill, a Churchill tank of the 48th Royal Tank Regiment got the better of a German Tiger I heavy tank. A 6 pounder shot from the Churchill lodged between the Tiger's turret and turret ring, jamming the turret and injuring the German crew. They abandoned the Tiger, which was subsequently captured by the British. Known as Tiger 131, this was the first Tiger captured by the Western Allies and was particularly useful for intelligence. Tiger 131 has since been restored to full working condition and is now on display at The Tank Museum in Dorset, UK. As of early 2021, it is the only working Tiger tank in the world.
Churchill tanks were not in use initially following the Allied invasion of the Italian mainland in 1943; there were six regiments with Churchills in Tunisia. They may have been kept out because Montgomery preferred the Sherman or because their 6-pdr guns were not suitable for the fighting in Italy. Churchills did land in Italy in April/May 1944 with 75mm gun armed Churchills arriving later. As the mainstay of the Tank Brigades, which operated in support of the infantry, Churchill units were in operation more often than other tank units.
The "NA75" conversions of Churchill Mark IIIs to carry the US 75 mm gun were used in Italy. As the Churchill proved to be a better gun platform than the Sherman, the effective range of the 75 mm was increased.
Churchills saw widespread action in Normandy during the Battle of Hill 112 and Operation Bluecoat, as well as subsequent operations in the Low Countries and into Germany, such as the fighting in the Reichswald during Operation Veritable.
The Churchill was able to cross the muddy ground and force through the forests of the Reichswald; a contemporary report expressed the belief that no other tank could have managed the same conditions.
Burma and IndiaEdit
A single Churchill, possibly a Mk V, was trialled in Burma in 1945. It was operated by the 3rd Dragoon Guards (Carabiniers) from the end of April 1945 for about a month. Although it proved impossible to bring the Churchill into action, on approach marches the tank proved at least the equal to the M3 Lee then in service.
The 254th Indian Tank Brigade returned to India from Burma, arriving at Ahmednagar during July 1945. The brigade immediately began conversion from the Lee to the Churchill, the intention being for the newly equipped brigade to return to operations in October 1945. At the time, it was assumed that the war against Japan would continue and that the new battleground would be Malaya. Although a small number of tanks were delivered, and some training undertaken, the end of the war against Japan meant that the conversion was not completed. At the end of September, the 254th Indian Tank Brigade was reassigned and posted away from Ahmednagar. All the Churchills delivered up to that point were returned to the Ordnance Depot at Kirkee (Khadki) by the end of November-early December 1945. Of the three regiments (battalions) involved, the 3rd Dragoon Guards accompanied the 254th Brigade when posted away while the 149th Regiment Royal Armoured Corps and the 150th Regiment Royal Armoured Corps were eventually disbanded at Ahmednagar on 28 February 1946, the majority of personnel already having been repatriated to the United Kingdom or posted to other units.
In mid-1944, at the request of Britain's War Office, the Churchill was tested by the Australian Army, along with the M4 Sherman. The results were to be used to determine any modifications required for use in the tropics; Matildas were used as a reference point in the tests at Madang, New Guinea. The Churchill was found to be, overall, superior to the other tanks for jungle warfare.
Korean War and afterEdit
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In late 1950, a Churchill Crocodile squadron (C squadron, 7th Royal Tank Regiment) was sent to Korea. In action against the Chinese, they mostly fought as gun tanks, for example in the Third Battle of Seoul. To restore the 1st Battalion, Royal Northumberland Fusiliers' position during the defence of Seoul, Brigadier Thomas Brodie of the 29th Infantry Brigade sent four Churchill tanks as reinforcement; their contributions to the battle were widely praised by British and American historians. These were the last use of the Churchill in action by the British. The tank remained in the service of the British Army until 1952 with one, a bridge-layer, remaining in service well into the 1970s.
The Soviet Union was sent 344 Churchill Mk III and Mk IV types as part of the Lend-Lease programme. 91 were lost en route on the Arctic Convoys. Initial deliveries were on Convoy PQ 17 (June 1942) and Convoy PQ 18 (September 1942) to Arkhangelsk.
In 1942–1943, Churchills were used in the Battle of Stalingrad (47th and 48th regiments of heavy tanks - 42 Churchills). In 1943, the Soviet 5th Guards Tank Army used Churchills in the Battle of Prokhorovka (15th and 36th regiments of heavy tanks - 42 Churchills) during the Battle of Kursk, and in the Fourth Battle of Kharkov. It was also used in other battles until 1944 (82nd regiment of heavy tanks).
Irish Army ServiceEdit
The Irish Army took delivery of three Churchill Mk VI tanks in 1948 and a fourth in 1949. These were rented from the British War Office as trials vehicles until 1954, when they were purchased outright. This purchase was despite the fact that the supply and transport corps workshops, which maintained them, had reported that spares had all but run out. Experiments were carried out involving replacing the existing Bedford engine with a Rolls-Royce Merlin engine salvaged from an Irish Air Corps Seafire aircraft. The experiment was not a success, although the reasons are not recorded. By 1967, only one Churchill remained serviceable, and by 1969 all were retired. One remains preserved in the Curragh Camp.
During the course of the war, as well as new production, older vehicles were reworked to bring them up to later standard. For example, 2-pdr turrets were replaced with the 6-pdr turret, and the improved commander's cupola (with eight periscopes) introduced after the first Mark VII was applied to some earlier marks as well. Nearly 3,100 Churchills of all marks were rebuilt. Early tanks were produced before the Churchill name was attached and were retroactively known as Churchill Mark I etc.
|Churchill tank development|
Churchill I (303 produced)
- Equipped with a 40 mm Ordnance QF 2-pounder gun in the turret with 150 rounds and a coaxial Besa machine gun. There was an Ordnance QF 3 inch howitzer in the hull, with 58 rounds, for use against infantry. It was a tank that was noted for poor mechanical reliability. It was used alongside Mark IIs and IIIs with Canadian forces on the Dieppe Raid and in Tunisia; some were still in use late in the war in Italy on the Gothic Line.
Churchill Mk II (1,127 produced)
- Replaced the hull howitzer with another machine gun to reduce cost and complexity. Sometimes referred to as "Churchill Ia".
Churchill Mk IICS (Close Support)
- Placed the 2-pounder gun in the hull and the howitzer in the turret, available in very limited numbers. Sometimes called the "Churchill II". Not used in combat.
Churchill Mk III (675 produced)
- The III was the first major armament overhaul of the series, eliminating the hull howitzer and equipping the tank with a more powerful Ordnance QF 6-pounder gun with 84 rounds. It had a new welded, "cleaner", squarish turret (from Babcock & Wilcox Ltd) unlike earlier versions. The availability of rolled armour plate limited the number that could be built - leading to the Mark IV. The first Mark to have "catwalks" over the upper track runs to protect the tracks; examples later upgunned with the QF 75 mm gun are known as the Churchill III*.
Churchill Mk IV (1,622 produced)
- The IV, the most numerous Churchill produced, was virtually identical to the III, the largest change being a return to the cheaper cast turret, keeping the welded turret's "clean" squarish shape. A telephone box was fitted to the rear of the tank for communication with infantry. In earlier models, turrets using the 6-pounder Mark V were fitted with a counterweight. Some were refitted with US 75 mm guns from Sherman tanks, while others were up-gunned with British Ordnance QF 75 mm guns, creating the Mark IV (75). The QF 75 mm had a muzzle brake unlike the 6-pounder.
Churchill Mk V (241 produced)
- A Churchill equipped with a close support Ordnance QF 95 mm howitzer with 47 rounds in place of the main gun in a cast turret. The gun could fire smoke, HE, or HEAT round with a maximum range of 6,800 yd (6,200 m).  Produced from the Mark IV production run at about 1 in 10. The turret was similar to the Marks IV/VI turrets, with a slightly different opening for the gun in the turret front face.
Churchill Mk VI (200 produced)
- Along with several minor improvements, such as an additional collar at the turret base protecting the turret ring, it was produced as standard with the 75 mm Mark V gun. Few were built due to the impending release of the VII and concurrent up-gunning of the Marks III/IV.
Churchill Mk VII (A22F) (1,600 produced, together with Mark VIII)
- The second big redesign, the VII used the 75mm gun, was wider and carried much more armour, 50 percent thicker at the front than a Tiger I, giving it the ability to withstand massive amounts of punishment. It is sometimes called the Heavy Churchill and was re-named "A42" in 1945. This version of the Churchill first saw service in the Battle of Normandy and equipped three Royal Armoured Corps regiments in western Europe, one in Italy and with 7th Royal Tank Regiment in Korea. The Mark VII was designed to be able to be converted into the Crocodile flame-throwing variant without major modification.
Churchill Mk VIII (1,600 produced, together with Mark VII)
- A Churchill VII with a 95 mm howitzer and 47 rounds in a slightly different turret.
Churchill Mk IX
- Churchill III/IV upgraded with extra armour added to hull and turret, along with gearbox and suspension modifications. If the original turret was retained without added armour it was called LT ("Light Turret").
Churchill Mk X
- The same improvements as for the IX applied to a Mk VI.
Churchill Mk XI
- The same improvements as for the IX applied to a MkV CS. Does not appear to have been built.
Churchill NA75 (200 produced)
- Churchill IVs with 6-pounder guns replaced (under Operation Whitehot) by US 75 mm guns and mantlets from destroyed or scrapped Sherman tanks, fitted to Churchill IV cast turrets. Their performance was virtually identical to the VI. They were known as NA 75 (North Africa 75) where the first conversions took place, after 48 Shermans with new guns had been disabled by mines. Some Mark IIIs were also modified, using Mark IV turrets. To fit the Sherman mantlet required cutting away the front of the Churchill turret before it was welded in place, then the mantlet slot had to be cut away to give sufficient elevation. The Sherman 75 mm gun was designed for a left hand loader and the Churchill, in common with British practice, had a right hand loader. The gun was turned upside down and the firing controls adapted. The conversion of about 200 tanks was carried out between March to June 1944 and the conversion project earned the officer in charge, Capt. Percy Morrell, an MBE and a promote.
A Churchill II or III with a flamethrower. The Oke flamethrowing tank was named after its designer, Major J.M. Oke. The design was basically a Churchill tank fitted with the Ronson flamethrower equipment. A tank containing the flame fuel was fitted at the rear, with a pipe from it leading to the fixed angle mounting on the front hull to the left, leaving the hull machine gun unobstructed. Three (named "Boar", "Beetle" and "Bull") were present in the first wave at Dieppe; they were quickly lost, and abandoned.
Churchill AVRE (Assault Vehicle Royal Engineers)Edit
Proposed by a Canadian engineer as a result of experience from the Dieppe Raid, the Assault Vehicle Royal Engineers was a Churchill Mark III or IV equipped with the "Mortar, Recoiling Spigot, Mark II" (or Petard), a 290 mm (11 in) spigot mortar that throws the 40 lb (18 kg) Bomb Demolition Number 1 ("Flying dustbin") with a 28-pound high-explosive warhead. The Petard, developed by MD1, was designed for the quick levelling of fortifications. The Petard was reloaded by traversing the turret to point front, slightly to the left, with the barrel directly over the co-driver's sliding hatch. The regular two piece co-driver's hatch was plated over, and a small sliding hatch was installed to allow access to the Petard. The Petard barrel would then be 'broken' vertically, and the co-driver would slide open his hatch. The co-driver would then push the projectile into the barrel. The barrel would then be closed, the Petard traversed back down, and the turret rotated back to its original position. The co-driver's hands were briefly exposed during the process.
The AVRE could also be equipped with numerous other attachments, such as the Small Box Girder bridge, which was carried at the front of the tank and laid across ditches or narrow rivers up to 30 feet wide, and the Canadian Indestructible Roller Device (CIRD), which was used to protect the tracks of a tank from mines. It could also carry fascines, which are large bundles of wood carried on the front of the tank and dropped into trenches to help the Churchill cross over them, devices to place explosive charges against obstacles, and bobbins: massive reels of canvas on drums that were unrolled in front of the Churchill to help it over soft terrain. They were used during the invasion of Normandy to help the Churchill over soft sand, and also served to leave a trackway for following vehicles.
By the time of the invasion of France in June 1944, 180 AVREs had been converted. They were first deployed in Normandy by the 79th Armoured Division on D-Day. They were extremely successful and served until the end of the war. A further 574 followed. While the driver came from the Royal Armoured Corps, the five other crew were drawn from the Royal Engineers. One of the RE crew was a demolitions NCO sapper responsible for priming the "Flying dustbin" and who led the crew when they dismounted from the tank to place demolition charges ("Wade" charges).
Other versions that did not see active service were equipped with anti-mine ploughs, mine rollers, or special demolition charges to destroy reinforced concrete walls.
Post-war, new Churchill AVREs were developed on the basis of a modified Churchill Mk VII armed with a breech-loading low velocity 165mm demolition gun that fired a HESH round with about 40 lb (18 kg) of C4 explosive. The name of the AVRE was later changed to Armoured Vehicle Royal Engineers.
Churchill ARV (Armoured Recovery Vehicle)Edit
Mk I – A turretless Mk I with a jib that could be fitted at front or rear. Production began in early 1942
Mk II – A Churchill Mark III or Mark IV with a fixed turret/superstructure with a dummy gun. It was equipped for recovering other tanks from the battlefield. It mounted a front jib with a 7.5 ton capacity, a rear jib rated for 15 ton and a winch that could pull 25 tons. With just a three-man crew, there was enough room to carry the crew of the tank being recovered. Armament was a single Besa machine gun.
Churchill ARK (Armoured Ramp Carrier)Edit
The Armoured Ramp Carrier was a turretless Churchill with ramps at either end and trackways along the body to form a mobile bridge. Fifty of these were built on Mark II and Mark IV Churchills. The Link Ark or Twin Ark was two ARKs used side by side to give a wide crossing. The ramps on these were folding types giving a longer, 65 ft (20 m), crossing. The Twin-ARK was used for the post-war Conqueror heavy tank.
Ark Mk II had a wider, 4 ft (1.2 m) instead of the usual 2 ft (0.61 m), trackway on the left side so narrower vehicles could also use the ARK. These were conversions of the Ark Mark I in mid-1944. The "Italian Pattern" Ark Mk II ( initially called "Octopus") was produced in Italy using US ramps on Churchill Mk III chassis and did not have trackways on the tank itself (vehicles drove on the tank's tracks).
"Lakeman Ark" was an experimental design for attacking very high obstacles. It was a turreted Churchill with the trackways built above the height of the turret, and long ramps at the rear.
The British already had experience of bridge-laying tanks with the Valentine tank and the Covenanter tank, and began work on a Churchill-based bridge-layer in 1942. The bridge ("Bridge, Tank, 30 ft, No.2 "), which could support a tank of 60 tons or be used by Class 40 wheeled traffic, was carried on top of a turretless Mk III or Mk VI chassis. When the obstacle was reached, an arm (driven by hydraulics in the tank) pivoted at the front of the tank and placed the bridge in position. The Churchill Mk VII was used with the No. 3 bridge from 1945-46.
Bridges could also be deployed by the Churchill. "Skid Bailey" was a bridge formed from Bailey bridge parts on skids that was moved into position by one or two Churchill AVREs. Usual use was to bridge cratered roads while under fire.
The "Mobile Bailey Bridge" was a complete bridge suitable for class 40 traffic spanning a 70–80 ft (21–24 m) gap. The bridge itself was 150 ft (46 m) long with 10 ft (3.0 m) ramps at either end. This would be assembled at a safe distance from the gap and then pushed to the site by a Churchill AVRE with another aiding by towing from the front; the middle of the bridge was supported by Orolo unpowered tracked roller units. At the site the AVRE pushed the bridge out over the gap and then disconnected itself.
The "Mobile Brown Bridge" was an improvement on the Mobile Bailey. Named after a Canadian Royal Engineer in Italy, the Bailey bridge was carried on a Churchill which had its turret removed while an AVRE carried and pushed the rear of the bridge. With the first Churchill in position the AVRE would push the bridge out over the gap; an extra 20 ft tail on the bridge acted as a counterweight while the bridge was put in position.
The "Mobile Dalton Bridge", named after an RE officer, was a 140 ft (43 m) long Bailey bridge that was carried on an ARK while a second AVRE pushed. The process was the similar to the Brown Bridge. When the ARK reached the near side of the gap, it stopped and the AVRE pushed the bridge (riding on rollers on the top of the ARK) out over the gap. Once the far end of the bridge was on solid ground the AVRE disengaged and the ARK backed out under the bridge.
The Churchill Crocodile was a Churchill VII that was converted by replacing the hull machine gun with a flamethrower. The fuel was in an armoured wheeled trailer towed behind. It could fire several one second bursts over 150 yards. The Crocodile was one of "Hobart's Funnies" – another vehicle used by the 79th Armoured Division. A working example can still be seen at the Cobbaton Combat Collection in North Devon.
The combination of projector and trailer was produced as a kit that could be fitted to a Churchill; no more than 800 kits were produced.)
Gun Carrier, 3-inch, Mk I, Churchill (A22D)Edit
Coming out of a General Staff request in 1941 to investigate fitting high velocity large calibre guns on infantry and cruiser tanks specifically for use against German tanks. Of the infantry tanks, neither the Churchill nor Valentine could mount a turret with a high velocity gun larger than the 6 pounder, but it was proposed that a fixed superstructure could carry a larger gun with limited traverse. The QF 3-inch 20 cwt anti-aircraft gun had been replaced by the 3.7-inch gun so these were selected and Vauxhall was provided with 100 guns and given the task of producing the vehicle.
The design used a fixed square thick plate superstructure with the gun in a ball mount low in the front next to the driver. The front was 88 mm (3.5 in), sides 76 mm (3.0 in) with overall weight of 39 tons. Internal stowage included a provision for 12 HE explosive rounds as well as the AP ones. 
As an anti-tank gun, the 3-inch gun had a maximum range of 12,000 yards and was a bit more effective than the 6-pounder at 1,000 yards but less than the 17-pounder under development. 
The pilot vehicles were ready for testing in early 1942 and found to be satisfactory. However in order not to impede production of the Churchill (with the 6-pounder gun) the order was reduced to 24 vehicles. Vauxhall was already set up for full production of the Gun Carrier with parts and armour ordered and complained with the result that the full order was re-instated before being cut back to 50. The 50 were built between July and November 1942 during which they were the subject of debate about whether they were artillery or tanks. The decision came down in favour of tank, and the Department of Tank Design asked for some changes; by that point in production these could not be incorporated. The prototype was built by Vauxhall and had a T-number, the other 49 by Beyer Peacock in Manchester, got WD numbers with an S prefix, the same as self-propelled guns. Requirements and tactics had in the meanwhile changed again to focus on the general purpose 75mm gun in the Churchill and a smaller proportion of 17-pounder tanks in use, of which work on the Cruiser Mk VIII Challenger was making progress.
None are known to have been used in combat as the 17-pounder anti-tank gun gave the British the necessary firepower. Some had the gun removed and converted to the "Snake" mine-clearing line charge device and used for trials and training of that in 1942-43.
Churchill Flail FV3902 or ToadEdit
A chargelayer, like the Double Onion device.
Churchill Great Eastern RampEdit
A much larger longer and higher trackway ramp than the ARK for crossing 60 ft (18 m). The 25-foot-long front ramps were launched into position with rockets. Ten built and two delivered in 1945 but not used in action.
Black Prince (A43)Edit
In 1943, an attempt was made to produce a 17 pounder armed tank on the Churchill chassis. It was known that insufficient numbers of the 17 pounder Challenger cruiser were going to be produced in time for the invasion of Europe, and work was only starting on the Centurion cruiser design. Due to the wider turret required, Vauxhall had to redesign the hull though it used as much of the Churchill Mark VII as possible. This resulted in the Tank, Infantry, Black Prince (A43). Six prototypes were built and delivered in May 1945 just as the war in Europe was ending. The test programme was completed but the project was cancelled due to the success of the new and less complicated Centurion Mark I, which offered the same armament and frontal armour, was faster and more manoeuvrable, and had just entered production.
- Australia - retired, replaced with the Centurion main battle tank
- Canada - retired, replaced with the Centurion
- India - retired
- Ireland - retired in 1969, replaced with the Comet cruiser tank
- Poland (Polish Armed Forces in the West) - retired in 1947 without replacement
- United Kingdom - retired, replaced with the Conqueror heavy tank and Centurion
- Soviet Union (Lend-Lease) - retired, replaced with IS-3 and T-10 heavy tanks
- Kingdom of Iraq - retired, replaced with the Centurion
A number of Churchills still exist as gate guardians or war memorials, while many examples reside in museums. Jacques Littlefield's Military Vehicle Technology Foundation in California, United States, acquired a Flail FV3902 "Toad" in its collection in 2008 after it was restored to full working order by RR Services in Kent, England; it was subsequently sold at auction and acquired by the Australian Armor and Artillery Museum. There are two Churchill Mark IVs at Normandy in France; one is residing at Lion-sur-Mer, while the other is located at Graye-sur-Mer.
The Churchill Trust is a project that aims to restore existing Churchills to their original condition and working order. So far, a Mark III AVRE with appliqué armour, salvaged from a firing range, and a post-war Mark IV Twin-ARK have been restored to running condition. The specialist equipment was removed and turrets were added, converting both tanks into their original variants. As of 2016[update] the project was in the process of restoring a Mark VII AVRE recovered from a range in northern England.
The Tank Museum in Bovington Camp, Dorset, England, currently has four Churchills in its collection: a Mark VII in The Tank Story Hall as a static exhibit, a working Mark III AVRE as a static display (currently located in the Museum's Conservation Hall), a Mark VI returned to the Museum after the closure of the Isle of Wight Military History Museum (also currently located in the Museum's Conservation Hall) and a Mark II (with cosmetic alterations to make it appear as a Mark I) as an outdoor static display. The museum's Mark VII was the last Mark VII produced; it went directly to the museum from the factory, and in terms of mileage, is virtually brand new. The Mark III AVRE was salvaged from a firing range marker as a complete wreck. It was restored to running order by Bob Grundy of Wigan and his Tracked Armour Group in August 1988. The Museum also has the only surviving Black Prince prototype.
The Churchill Trust and the Tank Museum are not affiliated or associated with one another in any way; their tanks are different and owned separately, and the only common ground between both parties is that the Churchill Trust sometimes sends its tanks to participate in the Tank Museum's annual Tankfest event. Additionally, the Churchill Trust's tanks were all specialist vehicles, but were converted back into the standard turreted heavy tank variants during restoration. In 2018 the two parties concluded a long-term agreement that saw the Churchill Trust loan all three of its Churchills to the Tank Museum, with the III* becoming a permanent part of the Museum's fleet of running vehicles and the IV and VII being included in the Museum's Second World War exhibitions. The Churchill III* was restored in time for Tankfest 2019, and ran at the event.
The Cavalry Tank Museum, Ahmednagar. Maharashtra, India has one Churchill Mark VII, a Mark X (uparmoured Mk VI chassis; Mk VII turret; 75mm gun; Mk VII driver's visor and MG mount), a Churchill bridgelayer and a Churchill ARV.
Tanks of the era of comparable role and performanceEdit
- British Excelsior - prototype heavy tank, two built, did not enter service
- American-British T14 - prototype heavy tank with similar specifications
- American M6 heavy tank - saw trials but never entered service
- Soviet KV-1 and KV-85 - heavy tanks with similar armour to Churchill VII
- German Tiger I, and Tiger II - heavy tank with similar armour thickness to Churchill VII
- TOAD Flail in reserve for British Army until mid-1960s
- It was thought the muzzle might catch in the ground, and a shortened version would have poor ballistics
- Who was also responsible for the triple differential design of the Merritt-Brown gearbox used in the Churchill.
- introduction of the 6-pounder gun into British use was delayed by the need to re-arm after the loss of equipment and production did not start until October 1941 and some designs in production could not take the larger gun
- The howitzer could fire smoke or HE but only smoke was carried as the range of the HE round was short and firing smoke was the purpose of the close support (CS) gun
- They replaced the 48th Royal Tank Regiment
- North Irish Horse, 51st Royal Tank Regiment and 142nd Regiment Royal Armoured Corps
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|Wikimedia Commons has media related to Churchill tank.|
- "Fabrication of the new Churchill Tank, MK VII". royaltankregiment.com. The Royal Tank Regiment Association. Archived from the original on 26 July 2011. Retrieved 6 March 2010.
- The Churchill Tank Project – aiming to restore a Mk III, Mk, IV, and Mk VII.
- Churchill Infantry Tank (A.22). wwiiequipment.com. Archived from the original on 10 August 2011. Retrieved 24 April 2012.
- Armour in Focus A22
- Henk of Holland
- OnWar specifications: Churchill I Churchill IV Churchill VII
- Development of the Churchill
- A20 developmental history
- WWII Vehicles
- Churchills in Soviet Union
- "Churchill" Heavy Infantry Tank in the Russian Battlefield
- Detailed vehicle description at 9th Battalion, Royal Tank Regiment website
- Detailed history of the 9th Battalion, using Churchills from introduction to war's end
- Memories of Frank Meredith Archived 17 May 2006 at the Wayback Machine, 9th Battalion Driver/Mechanic 1942–45
- "Churchills in Burma and India", at The Burma Campaign web site