These Australian guerrilla manuals were written by Ion Idriess at the time of imminent invasion by the Japanese. Following the massive bomb attack on Darwin in early 1942, Idriess wrote six manuals in one year to help aid the local militia, based on his extensive experience in guerrilla tactics in World War 1. As the Japanese continued to raid Sydney Harbour, Newcastle, Broome and Toowoomba, Idriess offered his knowledge on the art of warfare to Australians at home.