Naval operations World War, 1939-1945 63 Submarine 38 History 33 Campaigns 16 Biography 9 World war, 1939-1945 8 Naval operations, German 7 World War 7 Naval operations, American 6 World War, 1914-1918 6 Aerial operations 5 Naval operations, British 5 Pacific Ocean 5 Admirals 4 Civil War, 1861-1865 4 Naval convoys 3 Navy 3 United States 3 United States. Navy 3 20th century 2 Chronology 2 Falkland Islands War 2 Naval operations,German 2 Personal narratives 2 Personal narratives, American 2 Shipwrecks 2 Submarine warfare 2 Submarines 2 World War,1939-1945 2