After a short period of rest while Sattelberg was captured by the 26th Brigade, in late November the 2/15th joined the advance to Wareo, capturing Nongora village, crossing the Song River, and then undertaking patrols through the Christmas Hills until relieved by elements of the 4th Brigade, which pushed the Australian advance along the coast, forcing the Japanese north towards Sio as the Australians sought to secure the Huon Peninsula. In late December, the 20th Brigade rotated back into the lead, and the 2/15th took over from the 22nd Battalion around the Tunom River, where the battalion headquarters came under aerial attack. After a brief pause near the flood swollen Tunom, the advance continued throughout December and into January 1944 with minor skirmishes punctuating the battalion's advance. Finally, on 21 January, at the edge of the Sazomu River, the order arrived for the 2/15th to be withdrawn to Finschhafen for rest prior to repatriation to Australia. The fighting in New Guinea cost the battalion 30 killed in action, six dead from wounds, four dead from accidents and 119 wounded.