Attack on Mers-el-Kébir (1940): Britain Strikes the French Fleet

The attack on Mers-el-Kébir was a British naval bombardment of the French fleet at its base near Oran in French Algeria on 3 July 1940. Only days after France had signed an armistice with Germany, the Royal Navy opened fire on ships of its former ally to keep them out of German hands. About 1,300 French sailors were killed, and the attack left a bitter legacy between the two countries.

Background: a fleet without a war

France’s defeat in June 1940, described in the fall of France, left its navy largely intact. It was one of the strongest in Europe, with modern battleships such as Dunkerque and Strasbourg. The armistice signed on 22 June required French warships to return to their home ports and be disarmed under German or Italian supervision.

Germany promised not to use the French fleet for its own purposes, and Admiral François Darlan, the French navy’s commander, had ordered his ships to scuttle rather than be seized. Winston Churchill’s government did not trust the German promise. If the French ships were added to the German and Italian navies, Britain’s control of the seas, and with it its survival, could be threatened.

Operation Catapult

The British plan, Operation Catapult, was carried out on 3 July. French ships in British ports, such as Plymouth and Portsmouth, were boarded and seized; on the submarine Surcouf the takeover led to a fight in which men on both sides were killed. At Alexandria, Admiral Andrew Cunningham negotiated a peaceful agreement with the French admiral René-Émile Godfroy to disarm his squadron.

The largest French force lay at Mers-el-Kébir under Admiral Marcel-Bruno Gensoul. It included the battleships Dunkerque, Strasbourg, Bretagne and Provence, along with destroyers. Opposite it stood Force H from Gibraltar under Vice-Admiral James Somerville, with the battlecruiser HMS Hood, the battleships Valiant and Resolution, and the carrier Ark Royal.

The ultimatum

Captain Cedric Holland, a French-speaking officer who had served as naval attaché in Paris, was sent to present the British terms. Gensoul could join the British, sail with reduced crews to a British port, sail to the French West Indies or the United States for demilitarisation, or scuttle his ships within six hours. Otherwise the British would use force.

Gensoul at first refused to see Holland in person, and talks dragged on through the day. His report to the French admiralty is generally said to have mentioned only the choice between joining the British or scuttling, not the option of sailing to the West Indies. As the deadline passed, and with the British aware that French reinforcements had been ordered to the area, Somerville was told to settle the matter quickly.

The bombardment

Force H opened fire at about 17:55. In roughly ten minutes of shooting, the old battleship Bretagne was hit, blew up and capsized, killing nearly 1,000 men aboard her. Dunkerque and Provence were damaged and run aground, and the large destroyer Mogador was badly hit.

Strasbourg and several destroyers escaped from the harbour and, despite pursuit by aircraft from Ark Royal, reached Toulon. On 6 July Swordfish aircraft attacked the grounded Dunkerque again, causing further deaths. In total about 1,300 French sailors died. British losses were very light.

Consequences

The French government at Vichy broke off diplomatic relations with Britain within days, and French aircraft later bombed Gibraltar in retaliation. The attack fed anti-British feeling in France and made it harder for Charles de Gaulle’s Free French movement to recruit.

At the same time, the attack showed the world, and especially the United States, that Britain intended to fight on under Churchill whatever the cost. Churchill later described the decision as one of the most painful he ever took. When the House of Commons heard his account on 4 July, members gave him a prolonged ovation.

The main French fleet never did fall into German hands. When German troops moved into Vichy France in November 1942, the French navy scuttled its ships at Toulon, including Strasbourg and Dunkerque.

Legacy

In France, Mers-el-Kébir is remembered as a national tragedy, and memorials honour the sailors who died, including one at Toulon. In Britain it has often been presented as a grim necessity in the summer of 1940, the season of the Battle of Britain. Historians continue to debate whether more patient negotiation could have achieved the same result without bloodshed.

Timeline

• 1940, 22 June: France signs an armistice with Germany at Compiègne.
• 1940, 3 July, morning: French ships in British ports are seized; Captain Holland arrives off Mers-el-Kébir.
• 1940, 3 July, about 17:55: Force H opens fire; Bretagne explodes.
• 1940, 3 July, evening: Strasbourg escapes towards Toulon.
• 1940, 4 July: Churchill explains the action to the House of Commons.
• 1940, 6 July: British aircraft attack the grounded Dunkerque.
• 1942, 27 November: The French fleet scuttles itself at Toulon.

Why it matters

Mers-el-Kébir was one of the starkest decisions of the Second World War: a deliberate attack on a former ally to remove a threat that might never have come. It shaped British–French relations for years and signalled that Britain would not seek terms with Germany in 1940.