When the Japanese invade in 1942, the Australian men and women stationed at the New Guinea port of Rabaul flee into the jungle. Written off by their government as ‘hostages to fortune’, the little-known garrison on Australia’s tropic frontier has been left with no modern equipment, no lifeline to the outside, and no means of escape.

Most are captured and killed in the sinking of the prison ship Montevideo Maru, which remains Australia’s worst sea disaster. But the surviving soldiers and nurses carry on, to fight the Japanese on other fronts, or to witness the collapse of the Japanese Empire from the inside. Having borne the brunt of defeat, their letters and diaries also record the turning point of the war and the march to victory.