This book presents the work accomplished by the Royal Navy in combating the unrestricted submarine warfare instituted by the Central Powers in February, 1917. It is consequently largely concerned with the successive steps taken at the Admiralty to deal with a situation which was always serious, and which at times assumed a very grave aspect. The ultimate result of all Naval warfare must naturally rest with those who are serving afloat, but it is only just to the Naval officers and others who did such fine work at the Admiralty in preparing for the sea effort, that their share in the Navy's final triumph should be known. Contents: Admiralty Organization: The Changes in 1917 Submarine Campaign in the Early Part of 1917 Anti-submarine Operations The Introduction of the Convoy System The Convoy System at Work The Entry of the United States: Our Naval Policy Explained Patrol Craft and Minesweeping Services The Dover Patrol and the Harwich Forces The Sequel 'Production' at the Admiralty During 1917 Naval Work The Future