Naval operations 318 Submarine World War, 1939-1945 Naval operations, German 147 Campaigns 87 History 87 Naval operations, American 86 more ... Submarines (Ships) 34 Guerre mondiale, 1939-1945 33 Military operations, Naval 33 Opérations sous-marines 33 Naval operations, Japanese 26 Naval operations, British 21 Sailors 20 Submarine warfare 17 World War, 1914-1918 13 American 11 Opérations navales américaines 11 Shipwrecks 10 Submarine forces 10 German 9 Opérations navales allemandes 9 Siena Donor: Vallely, M.L.S., John R. 9 Anti-submarine warfare 8 Officers 8 Cryptography 7 Midget submarines 7 Aerial operations, American 6 History, Naval 6 Naval operations, Italian 6 less ...