David Montague Muir, born in Ballarat and a carpenter by trade, enlisted in the 8th Infantry Battalion as a Corporal. His unit embarked from Melbourne, Victoria, on board Transport A24 Benalla on 19 October 1914. Cpl Muir received a gunshot wound to the left leg on 25 April 1914 and was transferred to Malta for hospitalization. He was discharged to duty on 22 June 1915 and returned to duty in Gallipoli, where was promoted to Sergeant eight days later, on 30 June. Less than a year later, Sgt Muir was promoted to Lieutenant (Temp. Captain).

On 11 November 1916 Lt. Muir was wounded in the action with a gunshot wound to the hand and was evacuated as wounded to England again for hospitalization. On 23 February 1917 he rejoined his unit in France. Lt. Muir was awarded the Military Cross and was awarded, and promulgated, 'London Gazette' No. 30706 (28 May 1918); 'Commonwealth Gazette' No. 165 (24 October 1918). Recommendation date: 4 March 1918.

He embarked for Australia on 13 October 1918.
Tree No. 184