20th century World War, 1939-1945 History, Military 4 History 3 Biography 2 Campaigns 2 History, Naval 2 World War, 1914-1918 2 19th century 1 Baltic Sea Region 1 Bibliography 1 Diplomatic history 1 Equipment and supplies 1 Germany 1 Great Britain 1 Heads of state 1 Japan 1 Military biography 1 Military history, modern 1 Military weapons 1 Naval 1 Naval history, Modern 1 Naval operations 1 Naval operations, British 1 Naval strategy 1 Personal narratives, British 1 Philosophy 1 Poets, English 1 Shipwrecks 1 Weapons 1