Bushwhackers -- See Guerrillas Here are entered general and historical works. Works on the military aspects of guerrilla warfare are entered under the heading Guerrilla warfare. International legal aspects of guerrilla warfare are entered under the heading Guerrillas (International law). Municipal criminal law is entered under the heading Guerrillas--Law and legislation. --subdivision Underground movements under individual wars, e.g. World War, 1939-1945--Underground movements