The 1st Division is the main formation of the Australian Army and contains the majority of the Army's regular forces. Its headquarters is in Enoggera, a suburb of Brisbane. The division was first formed in 1914 for service during World War I as a part of the Australian Imperial Force (AIF). It was initially part of the Australian and New Zealand Army Corps (ANZAC) and served with that formation during the Gallipoli campaign, before later serving on the Western Front. After the war, the division became a part-time unit based in New South Wales, and during World War II it undertook defensive duties in Australia before being disbanded in 1945.