Cameraman Damien Parer has just returned from the front in New Guinea, where he's documented Australian troops in action. He explains this to us in a prolog. We then see air drops of supplies, wounded men being carried on stretchers by native porters, and men leaving camp to go to the front. There's a tiny bit of possibly staged combat footage. A narrator explains that the Japanese soldiers are expert at disguise, and how important support from the home front is.