World War, 1939-1945 1,625 History 558 Foreign relations 290 Diplomatic history 192 Campaigns 187 Secret service 187 Guerre mondiale, 1939-1945 164 more ... Politics and government 117 Regimental histories 107 Aerial operations, British 80 World War, 1914-1918 62 Causes 58 Cryptography 56 Social aspects 55 Prisoners of war 49 Military intelligence 48 Naval operations, British 44 Women 43 Underground movements 41 Influence 40 Diplomatic relations 39 Histoire 38 Generals 37 History, Military 36 Relations extérieures 35 Soldiers 35 Spies 35 Military leadership 34 Economic aspects 33 History and criticism 33 less ...