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The Destruction of the French Fleet at Mers-el-Kebir by the British Royal Navy took place on July 3, 1940.
In 1940, during World War II, following the surrender of France to the advancing forces of Nazi Germany, the British were unable to discover whether the terms of the surrender would allow the French fleet to be used against Britain. Such a shift in the balance of power at sea would have seriously threatened Britain's ability to keep her supply lines open, and jeopardise her survival. Winston Churchill therefore personally ordered that the French navy should either fight alongside the Royal Navy or be neutralised in some way, preventing it from falling into German hands. To prevent this, they launched Operation Catapult.
The French fleet was widely dispersed at this time. Some were in port in France; others had escaped from France to British controlled ports, mainly in Britain itself or Alexandria in Egypt. Those ships in Britain were simply boarded. Many went on to be used by the Free French forces, and some sailors joined the Free French. Others were repatriated to France.
The most powerful concentration of French warships at the time was the flotilla located at the port of Mers-el-Kebir in French Algeria. This consisted of the old battleships Provence and Bretagne, the modern battleships Dunkerque and Strasbourg, the aviation transport Commandante Teste and 6 destroyers, all under the command of Admiral Gensoul. The British Admiral Somerville of Force H, based in Gibraltar, was ordered to deliver an ultimatum to the French, stating:
Admiral Gensoul refused, and both fleets prepared for battle. In the ensuing action on July 3, 1940, Bretagne was sunk, while Provence and Dunkerque were badly damaged, with over 2,000 French sailors killed. Strasbourg meanwhile was able to escape and return to the French port of Toulon. The action severly strained relations between Britain and France for some time, and gave the Germans a propaganda coup.