The Fourth Manual written for Australian soldiers and civilians in 1942, when invasion by the Japanese seemed imminent. To attack and to ambush, to snipe and raid is the job of the Australian Guerrilla. By rifle and grenade, by machine-gun and mortar to kill them, harry them, trap them, grant them not one moment’s peace day or night. Break their hearts! Smash their out-posts, blow up their tanks, bomb their communications, burn their airfields. To be a hawk by day and a shadow by night, to be a killer by night or day is the sworn job of the Australian Guerrilla on his native soil.