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-764 the war. In eight patrols she sank one merchant ship, for a total of , and 2 warships sunk (1,696 tons). "U-764" took part in eight wolfpacks, namely "U-764" surrendered on 14 May 1945 at Loch Eriboll, Scotland. She was sunk as a target in position as part of Operation Deadlight on 2 February 1946. German submarine U-764 German submarine "U-764" was a Type VIIC U-boat built for Nazi Germany's "Kriegsmarine" for service during World War II. She was laid down on 1 February 1941 by Kriegsmarinewerft Wilhelmshaven as yard number 147, launched on 13 March 1943 and commissioned on