The Attack on Mers-el-Kébir, part of Operation Catapult and also known as the Battle of Mers-el-Kébir, was a British Navy bombardment of the French Navy at its base at Mers-el-Kébir on the coast of what was then French Algeria on 3 July 1940. A British naval task force attacked the French fleet, which was at anchor and not expecting an assault from the United Kingdom, France’s former ally. The attack resulted in the deaths of 1,297 French servicemen, the sinking of a battleship and the damaging of five other ships.