In June 1943, the regiment returned to the 6th Division and was moved to the Atherton Tablelands, where it was re-organised for jungle warfare. This resulted in the regiment's establishment dropping to 688 personnel. It was also re-equipped with a quantity of short 25-pounders as well as some of the standard pieces. Throughout late 1943 and into 1944, the regiment was based around Wondecla, in Queensland. Due to a perception in the Army that there was little need for artillery in jungle warfare, the regiment did not see action again until December 1944 when it joined the 6th Division's campaign in Aitape–Wewak, once again assigned to the 19th Brigade. In January 1945, the regiment received four 4.2-inch mortars to assist in the provision of close support to long-range infantry patrols; two 155 mm guns were also added to the regiment's equipment scale. Throughout January and February, the regiment supported the advance from Aitape to the Danmap River. As the campaign progressed, in March they were switched to operations between Maprik and Wewak. Late in the campaign, Bleby left the regiment on promotion to 1st Division Headquarters and was replaced by Lieutenant Colonel Cecil Chapman. The regiment saw action right up until the end of the war, and had the distinction of firing the last fire mission in the New Guinea campaign, when on 15 August, it fired 1,000 rounds on "six regimental targets" eight hours after Japan's surrender to deal with a Japanese artillery unit that was continuing to hold out.