During 1945 two 4th Armoured Brigade regimental groups saw action in the Borneo campaign. C Squadron of the 2/9th Armoured Regiment was attached to the 26th Brigade Group during the invasion of Tarakan in May 1945. The remainder of this regiment subsequently supported the 9th Division during the early stages of the Battle of North Borneo from 10 June. The 1st Armoured Regiment and Armoured Squadron (Special Equipment) were attached to the 7th Division, and took part in the Battle of Balikpapan from 1 July.