ポートモレスビー作戦
Following Japan's entry into the war, the 25th Brigade was transferred back to Australia and subsequently took part in the fighting in New Guinea. Throughout 1942–1943, the brigade fought in the final stages of the Kokoda Track campaign and around Buna–Gona. Later, they took part in the fighting around Lae and Shaggy Ridge, before being withdrawn to Australia for a long period of rest and reorganisation. In 1945, the 25th Brigade was committed to the Borneo campaign, carrying out an amphibious landing at Balikpapan in July 1945 before being disbanded in 1946.