After over a year, the battalion was committed to its final campaign of the war, transiting through Morotai Island as it joined the fighting on Borneo. 'D' Company supported the 26th Brigade during its assault on Tarakan Island in May, while the rest of the battalion supported the landings on Labuan Island and around Brunei Bay during the Battle of North Borneo. It was a short, but sharp campaign. During this time, in addition to their normal close support role, the machine gunners were often used as infantry, conducting extensive patrolling in search of Japanese stragglers which resulted in a number of clashes, as well as conducting defensive tasks against infiltrators and raiding parties. In North Borneo, a number of members of the battalion were also used to assist with the operation of a narrow gauge railway which had been brought back into service to maintain the Australian supply line. In early August, the dropping of the atomic bombs on Hiroshima and Nagaskai brought the war to an end. The battalion's casualties during the campaign in Borneo totaled five dead and six wounded, while casualties on Tarakan amounted to five soldiers killed or wounded.