 Following the evacuation of Gallipoli in December 1915, the Australian government decided to expand the Australian Imperial Force by creating three additional divisions on top of the two that already existed.This was achieved by splitting the battalions of the first four brigades that had fought at Gallipoli to provide an experienced cadre for the new battalions that were being formed from reinforcements that had arrived from Australia.Through this process, the 3rd Brigade was divided to form the 13th Infantry Brigade.