World War, 1939-1945 History 53 Campaigns 39 Germany 16 Biography 14 Secret service 8 Tank warfare 7 Armed Forces 6 Equipment and supplies 6 Politics and government 6 Regimental histories 6 Aerial operations 5 Aerial operations, British 5 Military intelligence 5 Nazis 5 Airplanes, Military 4 Diplomatic history 4 Equipment 4 Foreign relations 4 Generals 4 History, Military 4 National socialism 4 Naval operations 4 Personal narratives 4 Waffen-SS 4 Aerial operations, German 3 Destruction and pillage 3 Eastern Front 3 Fighter pilots 3 Marshals 3