World War 83 History 45 Campaigns 33 World war 19 Biography 15 World War, 1939-1945 15 Naval operations 9 Juvenile literature 6 Personal narratives 6 Submarine 6 Causes 5 Aerial operations 4 Army 4 Campaign 4 Generals 4 Foreign relations 3 Japanese occupation 3 Military intelligence 3 Pictorial works 3 Prisoners and prisons 3 Bibliography 2 Diplomatic history 2 Equipment and supplies 2 Heads of state 2 Kriegsmarine 2 Military leadership 2 Naval operation 2 Naval operations, German 2 Navy 2 Prisoners of war 2