In 1942 the Australian 16th and 25th AIF Brigades, supported by militiamen of the 3rd Battalion, forced the Japanese back over the KokodaTrail and into a narrow strip in the Buna-Gona-Sanananda area along the northern New Guinea coast. It was decided the Australians would clear the Gona-Sanananda area; the Americans would attack Buna. The inexperienced 32nd U.S. Infantry Division gathered south of Buna, and on 19 November 1942 the confident main American assault began. The veteran Japanese jungle fighters, recently reinforced, were ready.