Despite the loss of his left leg, Gault refused repatriation to Canada and returned to France where he was initially seconded as Aide-de-camp to Major General Victor Williams, the General Officer Commanding 3rd Canadian Division. Later Gault commanded the 3rd Canadian Division Reinforcement Camp (CCRC) with the local rank of lieutenant colonel. He was promoted to lieutenant colonel of his own regiment on 28 March 1918 but remained seconded with CCRC. Finally, he rejoined his regiment on 21 November 1918, and commanded the Patricia's until demobilization. He was awarded the Distinguished Service Order; the Russian Order of St. Anne (Third Class with Swords); the Belgian Ordre de Leopold and was four times Mentioned in Despatches.