WThe following is a list of Australian divisions in World War I, including all infantry and mounted divisions of the Australian Army during that conflict. During the war, Australia raised an all volunteer force for overseas service, known as the Australian Imperial Force, which subsequently served in several theatres, including the Gallipoli Campaign, the Sinai and Palestine Campaign and on the Western Front in France and Belgium. Between the start of the war in August 1914 and its end in November 1918, Australia raised a total of seven infantry divisions, one of which – the New Zealand and Australian Division – was also manned by New Zealanders. Of these, six took part in combat, while one – the 6th – was broken up in the United Kingdom and disbanded in September 1917 before being deployed due to manpower shortages. In addition, there were two mounted divisions raised: the ANZAC Mounted Division and the Australian Mounted Division.
WThe 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.
WThe 2nd Division of the Australian Army commands all the Reserve brigades in Australia. These are the 4th in Victoria, the 5th in New South Wales, the 9th in South Australia and Tasmania, the 11th in Queensland, the 13th in Western Australia, and the 8th spread across the country. The division is also responsible for the security of Australia's northern borders through its Regional Force Surveillance Units.
WThe 3rd Division was an infantry division of the Australian Army. Existing during various periods between 1916 and 1991, it is considered the "longest serving Australian Army division". It was first formed during World War I, as an infantry division of the Australian Imperial Force and saw service on the Western Front in France and Belgium. During this time it fought major battles at Messines, Broodseinde Ridge, Passchendaele, Amiens, and the St Quentin Canal.
WThe Australian 4th Division was formed in the First World War during the expansion of the Australian Imperial Force (AIF) infantry brigades in February 1916. In addition to the experienced 4th Brigade were added the new 12th and 13th Brigades. From Egypt the division was sent to France, where it took part in the fighting on the Western Front during 1916–1918. After the war ended, the AIF was demobilised and the division was dissolved.
WThe 5th Division was an infantry division of the Australian Army which served during the First and Second World Wars. The division was formed in February 1916 as part of the expansion of the Australian Imperial Force infantry brigades. In addition to the existing 8th Brigade were added the new 14th and 15th Brigades, which had been raised from the battalions of the 1st and 2nd Brigades respectively. From Egypt the division was sent to France and then Belgium, where they served in the trenches along the Western Front until the end of the war in November 1918. After the war ended, the division was demobilised in 1919.
WThe Australian and New Zealand Mounted Division was a mounted infantry division of the British Empire during the First World War. The division was raised in March 1916 and was assigned to the I ANZAC Corps. On establishment, it consisted of four brigades comprising three Australian light horse and one New Zealand mounted rifles, supported by British horse artillery. In 1917, one of the Australian brigades was replaced by a British yeomanry brigade. After April 1917, the standard order of battle was reduced to two Australian brigades and one New Zealand brigade, although the Imperial Camel Corps Brigade and other British mounted brigades were temporarily attached several times during operations.
WThe New Zealand and Australian Division was a composite army division raised for service in the First World War under the command of Major General Alexander Godley. Consisting of several mounted and standard infantry brigades from both New Zealand and Australia, it served in the Gallipoli Campaign between April and December 1915.