World War, 1939-1945 History 42 Biography 21 Secret service 20 Aerial operations, British 16 Campaigns 15 Regimental histories 15 Foreign relations 12 Personal narratives, British 11 Great Britain 10 Diplomatic history 8 World War, 1914-1918 7 Military leadership 6 Naval operations, British 6 Economic aspects 5 Fighter pilots 5 Generals 5 Causes 4 Commando operations 4 History, Military 4 Soldiers 4 Commando troops 3 Strategy 3 Tank warfare 3 Aerial Operations, British 2 Armed Forces 2 Army 2 Cryptography 2 Deception 2 Finance 2