John Mordaunt (British Army officer)

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General Sir John Mordaunt KB (1697 – 23 October 1780) was a British soldier and Whig politician, the son of Lieutenant-General Harry Mordaunt and Margaret Spencer. He was best known for his command of the Raid on Rochefort which ended in failure and his subsequent court-martial. Cleared on a technicality, he was nonetheless barred from holding further military command.

John Mordaunt
General Sir John Mordaunt.jpg
General Sir John Mordaunt by Allan Ramsay
Died23 October 1780 (aged 82–83)
Allegiance Kingdom of Great Britain
Service/branch British Army
Battles/warsJacobite Rebellion
Seven Years' War
AwardsKnight Companion of the Order of the Bath

Early careerEdit

Mordaunt entered the army in 1721 and was promoted captain in George Wade's Regiment of Dragoon Guards in 1726. He became a lieutenant-colonel in the 3rd Foot Guards in 1731.

He entered Parliament for Pontefract in 1730, for which he sat until 1734, and was then member for Whitchurch 1735–1741 and Cockermouth 1741–1768. In Parliament he was a steadfast Whig and supporter of Robert Walpole. In 1739 he became a founding governor of the Foundling Hospital.

On 18 December 1742 Mordaunt was promoted to the rank of full colonel of the Royal Regiment of Ireland, which was sent in 1744 to protect the Netherlands against French invasion. The regiment was recalled in November 1745 to put down the Jacobite rising of 1745, and Mordaunt was promoted brigadier-general. He was present for several engagements of that campaign, rallying and re-forming the beaten troops after the Battle of Falkirk. He commanded one of the two divisions of the army when it left Edinburgh under the command of the Duke of Cumberland. He commanded the third line (reserve) at the Battle of Culloden, and was detached after the battle to pursue the Highlanders. Cumberland presented him with the coach of Bonnie Prince Charlie as a mark of favour.

In 1747, he was promoted major-general and made colonel of a dragoon regiment (later the 12th Dragoons). He led a brigade of infantry at the Battle of Lauffeld, and was made a Knight Companion of the Order of the Bath at the end of the War of the Austrian Succession. He was appointed Governor of Sheerness in 1752. James Wolfe, who was his houseguest while courting his niece in 1754, remarked on his civility and pleasant manner.


On the outbreak of the Seven Years' War in 1756, Mordaunt was placed in charge of training troops at Blandford. The next year, he was appointed to command an amphibious assault on the French port of Rochefort. The immediate objective was to destroy France's Royal Dockyard at the port. A secondary objective was to highlight Britain's capacity to strike at the French mainland, and force France to withdraw troops from other conflicts to defend its western coastline. The plan was championed at the highest levels, including by British Prime Minister William Pitt.[1]

Mordaunt was placed in overall Army command for the assault, supported by Major-General Henry Seymour Conway and Colonel Edward Cornwallis. Royal navy command was vested in Admirals The naval commanders, Sir Edward Hawke and Sir Charles Knowles.

The force of 31 warships and 49 transports carrying 10 battalions of soldiers set sail on 6 September 1757, and captured the Île d'Aix on 21 September. However, they now discovered that shallow water would prevent the ships from approaching closer than a mile and a half from shore, requiring a long and hazardous landing by boats. An attack was planned on the basis of a report by Colonel James Wolfe, who had gone ashore at Rochefort with a scouting party and concluded that the French garrison as too weak to prevent the landing.[2] Wolfe urged Mordaunt into action, offering to capture the town himself if given just 500 men.[3] Despite the report, Mordaunt remained uncertain of victory. On 25 September he called a council of war aboard HMS Neptune, where debate included the prospect of French reinforcements and the possibility that the French might better fortify the town before the British troops could arrive. After two days' discussion, Mordaunt and Conway concluded that assaulting Rochefort was "neither advisable nor practical".[2]

A second council, called on 28 September aboard HMS Ramillies, reversed this decision and decided on a night attack upon the forts at the mouth of the River Charente, with the first embarkation to be led by Mordaunt in person. However, Mordaunt remained equivocal, and the attack did not proceed. Frustrated at the Army's refusal to act, Admiral Hawke declared that as the Army had no willingness to make an assault, the fleet would return to England. The expedition set sail on 29 September and reached Portsmouth on 6 October.[2]

The Whisker's. Or Sr Jn Suckling's Bugga Boh's, a 1757 caricature ridiculing Mordaunt and the aborted raid

Pitt was furious at the failure of the expedition, and at the expenditure of more than £1,000,000 without result. A board of inquiry was convened under the auspices of Charles Spencer, 3rd Duke of Marlborough, George Germain, 1st Viscount Sackville and John Waldegrave, 3rd Earl Waldegrave. In keeping with Wolfe's report to Mordaunt, the board found that "it does not appear to us that there were then, or at any time afterwards either a Body of Troops or Batteries on the Shore sufficient to have prevented the attempting a Descent" and that it did not believe the defences of Rochefort could have been sufficiently improved so as to repel an assault. In the wake of the inquiry, Mordaunt was tried by court-martial in December.

Mordaunt's defence centred on the technicality that his instructions for the expedition did not include an absolute requirement to make a landing. He was acquitted of disobedience, but George II removed Mordaunt, Conway and Cornwallis from the staff in July 1758.[2]

Later careerEdit

Mordaunt retained his commission, but having earned the King's displeasure after Rochefort, he never again held a senior field command. He was promoted general in 1770, and was Governor of Berwick-upon-Tweed from 1778 until 1780. He died in his home near Southampton in 1780. He never married and left no children.


  1. ^ Robson 2016, pp. 52-53
  2. ^ a b c d Robson 2016, pp. 55-56
  3. ^ Johnston p. 138
  • Towse, Clive (2004). "Mordaunt, Sir John (1696/7–1780)". Oxford Dictionary of National Biography. Oxford University Press. Retrieved 1 October 2006.


Parliament of Great Britain
Preceded by
John Lowther
Sir William Lowther, Bt
Member of Parliament for Pontefract
With: Sir William Lowther, Bt
Succeeded by
Sir William Lowther, Bt
The Viscount Galway
Preceded by
John Selwyn
John Selwyn
Member of Parliament for Whitchurch
With: John Selwyn
Succeeded by
John Selwyn
John Wallop
Preceded by
William Finch
Eldred Curwen
Member of Parliament for Cockermouth
With: William Finch 1741–1747, 1747–1754
Sir Charles Wyndham, Bt 1747
The Earl of Thomond 1754–1761
Charles Jenkinson 1761–1767
John Elliot 1767–1768
Succeeded by
Sir George Macartney
Charles Jenkinson
Military offices
Preceded by
Regiment raised
Colonel of John Mordaunt's Regiment of Foot
Succeeded by
Peregrine Lascelles
Preceded by
John Armstrong
Colonel of the Royal Regiment of Ireland
Succeeded by
John Folliott
Preceded by
Thomas Bligh
Colonel of Sir John Mordaunt's Regiment of Dragoons
Succeeded by
James Cholmondeley
Preceded by
Sir John Ligonier
Colonel of Sir John Mordaunt's Regiment of Horse
Succeeded by
Henry de Grangues
Preceded by
The Viscount Cobham
Colonel of the 10th Regiment of Dragoons
Succeeded by
William Augustus Pitt
Preceded by
The Lord Cadogan
Governor of Sheerness
Succeeded by
Francis Craig
Preceded by
Sir John Clavering
Governor of Berwick-upon-Tweed
Succeeded by
Hon. John Vaughan
Court offices
Preceded by
Robert Blount
Page of Honour
Succeeded by
Emanuel Howe