RMS Mauretania (1906) and were requested by the British government to become armed merchant cruisers, but their huge size and massive fuel consumption made them unsuitable for the duty, and they resumed their civilian service on 11 August. Later, due to lack of passengers crossing the Atlantic, "Mauretania" was laid up in Liverpool until May 1915 at the time that "Lusitania" was sunk by a German U-boat. "Mauretania" was about to fill the void left by "Lusitania", but she was ordered by the British government to serve as a troop ship to carry British soldiers during the Gallipoli Campaign. She avoided becoming prey
German submarine U-657 sank one merchant ship, for a total of . "U-657" took part in six wolfpacks, namely "U-657" was sunk on 17 May 1943 in the North Atlantic, E of Cape Farewell, Greenland, in position , by depth charges from Royal Navy frigate . All hands were lost. German submarine U-657 German submarine "U-657" was a Type VIIC U-boat built for Nazi Germany's "Kriegsmarine" for service during World War II. She was laid down on 5 October 1940 by Howaldtswerke, Hamburg as yard number 806, launched on 12 August 1941 and commissioned on 8 October 1941 under "Oberleutnant zur See" Hans-Jürgen