Submarine warfare 87 History 57 Naval operations 41 Anti-submarine warfare 38 Submarine 36 World War, 1939-1945 35 Submarines (Ships) 33 plus ... Naval operations, German 16 World War, 1914-1918 16 Guerre sous-marine 14 Campaigns 7 Military operations, Naval 7 Naval operations, American 7 Submarine forces 7 Histoire 6 Cold War 5 Naval operations, British 5 Opérations sous-marines 5 Submarine boats 5 Guerre mondiale, 1939-1945 4 Aerial operations, American 3 Aviation 3 Guerre anti-sous-marine 3 Naval hygiene 3 Physiology 3 Psychology, Military 3 Sea-power 3 Sonar 3 Sous-marins 3 Torpedoes 3 moins ...