Enlistment, August 1915, to Western Front, September 1918 On 5 August 1915, Wark enlisted in the Australian Imperial Force, He proceeded to the Sydney suburb of
Liverpool, where he attended an infantry school before training at the
Royal Military College, Duntroon. the battalion was tasked with the defence of the Suez Canal where, on 20 February 1916, Wark was promoted to
captain. Wark commanded a company during the action, and on 2 January 1917, Wark gained admission to the Army Infantry School. By February he was back with the 32nd Battalion, and took part in actions at Sunray Trench during March. For these, and further actions at Fromelles, Wark was recommended for the
Distinguished Service Order, but the award was never made. For his actions during the battle, Wark was awarded the Distinguished Service Order, the details of which were published in a supplement to
The London Gazette on 3 June 1918. Granted sixteen days leave to the United Kingdom from 3 November, Wark was selected for a senior officers' course at
Aldershot, England, in January 1918. Throughout June and July, Wark temporarily commanded the 32nd Battalion, in 2012 The 32nd Battalion was to commence its attack at Bellicourt at 09:00 on 29 September, and move south through the village. At 15:00, he halted his battalion near Joncourt, and sent out patrols which found the town still occupied by enemy forces. The 32nd Battalion was resting and retraining away from the frontline when the
Armistice was signed on 11 November 1918. On 5 January 1919, Wark was granted leave to the United Kingdom, where he accepted his Victoria Cross from
King George V on 13 February. Returning to his unit six days later, Wark was then assigned to the 30th Battalion, and sent back to England in preparation for demobilisation. On 31 May 1919, Wark married writer Phyllis Marquiss Munro at St George's Parish Church, Worthing, Sussex; ten days later, he boarded HT
Port Lyttleton to return to Australia, where he was discharged from the Australian Imperial Force on 28 September 1919. Two of Wark's brothers also served in the First World War, both in the 56th Battalion; Alexander was a sergeant, and Keith, a recipient of the
Distinguished Conduct Medal, rose to the rank of lieutenant. ==Later life==