The units of the 4th Armoured Brigade were concentrated at Singleton, New South Wales, on 10 March 1943. As of April that year, the brigade formed part of the Land Headquarters Reserve. The 1st Army Tank Battalion was subsequently transferred to Caboolture in southern Queensland and reorganised as a self-supporting battalion group while remaining part of the 4th Armoured Brigade. The unit was redesignated the 1st Tank Battalion on 10 June 1943, and in August that year was shipped to Milne Bay in New Guinea. It subsequently supported the 9th Division during the Landing at Lae and Huon Peninsula campaign. The 1st Tank Battalion returned to Australia in June 1944 and was redesignated again to become the 1st Armoured Regiment. In the meantime the 2/4th Armoured Regiment was added to the 4th Armoured Brigade in October 1943; this unit had previously formed part of the 3rd Armoured Division and was re-equipped with Matilda II tanks. Also in October 1943, a party from the 4th Armoured Brigade armed with pistols was sent to Grovely Camp near Brisbane to put down a riot by soldiers being held under detention there, but did not need to use force. During March 1944 the 2/6th Armoured Regiment was transferred to the 1st Armoured Brigade Group, and the 2/5th Armoured Regiment was transferred from that formation to the 4th Armoured Brigade.
