The Cocos Islands mutiny was a failed mutiny by Ceylonese (Sri Lankan) soldiers against British officers, on the Cocos (Keeling) Islands on May 8, 1942, during the Second World War. The mutineers were to seize control of the islands and disable the British garrison. It was claimed that the mutineers also planned to transfer the islands to the Empire of Japan. However, the mutiny was defeated after the Ceylonese failed to seize control of the islands. Many mutineers were punished, and the three ringleaders were executed; they were the only British Commonwealth servicemen to be executed for mutiny during the Second World War.