Underground movements World War, 1939-1945 662 History 422 Guerrillas 132 War 64 Guerre mondiale, 1939-1945 57 Mouvements de résistance 54 more ... Secret service 52 Jews 48 Politics and government 48 Holocaust, Jewish (1939-1945) 42 Campaigns 35 Histoire 33 Women 28 Collaborationists 25 Guerrilla warfare 25 Vietnam War, 1961-1975 24 History, Military 23 Prisoners and prisons, German 23 Soldiers 23 Counterinsurgency 21 Prisoners of war 20 Spies 20 Escapes 19 Anti-Nazi movement 18 Jewish resistance 15 Refugees 14 Foreign relations 13 Rescue 12 Assassination 11 less ...