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-309 German submarine U-309 German submarine "U-309" was a Type VIIC U-boat of Nazi Germany's "Kriegsmarine" during World War II. The submarine was laid down on 24 January 1942 at the Flender Werke yard at Lübeck, launched on 5 December 1942, and commissioned on 27 January 1943 under the command of "Oberleutnant zur See" Hans-Gert Mahrholz. She sailed on nine combat patrols, but damaged only one ship, before being sunk off Scotland on 16 February 1945. German Type VIIC submarines were preceded by the shorter Type VIIB submarines. "U-309" had a displacement of when at the surface and while submerged. She