On 22 October, Admiral Graf Spee encountered and sank the steamer Trevanion.[23] At the end of October, Langsdorff sailed his ship into the Indian Ocean south of Madagascar. The purpose of that foray was to divert Allied warships away from the South Atlantic, and to confuse the Allies about his intentions. By this time, Admiral Graf Spee had cruised for almost 30,000 nautical miles (56,000 km; 35,000 mi) and needed an engine overhaul.[24] On 15 November, the ship sank the tanker Africa Shell, and the following day, she stopped an unidentified Dutch steamer, though did not sink her.