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.
Kasnije, radi nedostatka putnika tijekom rata, brod je bio u raspremi u Liverpoolu do svibnja 1915., kada je blizanac Lusitania potopljen od njemačke podmornice.