Naval operations History 32 World War, 1939-1945 31 World War, 1914-1918 12 Warships 10 Submarine 9 Siena Donor: Vallely, M.L.S., John R. 8 more ... Navies 5 Submarines (Ships) 5 History, Naval 4 Battleships 3 Naval art and science 3 Naval history, Modern 3 Weapons systems 3 Aerial operations 2 Antiquities 2 Armored vessels 2 Design and construction 2 Equipment and supplies 2 Military operations, Naval 2 Napoleonic Wars, 1800-1815 2 Naval convoys 2 Naval operations, German 2 Naval strategy 2 Submarine boats 2 Submarine forces 2 Torpedoes 2 Underwater archaeology 2 Air warfare 1 Aircraft carriers 1 less ...