Charles Austin Wallis was born in Creswick, VIC and was a Labourer when he enlisted in the 29th Battalion, 1st Reinforcement on 19 July 1915 at the age of 22. His unit embarked from Melbourne, Victoria, on board HMAT A11 Ascanius on 10 November 1915. He joined the 29th Battalion at Serapeum in January 1916 and in June moved to France. His service record is one of a soldier who avoided illness, battle wounds and discipline issues. He returned to Australia after the war, disembarking from the Devanha on June 23rd 1919.

He had two brothers that also served: Private Henry Matthew Wallis, 38th Battalion, returned to Australia, 30 April 1919 (Tree No. 3498); Private William Gordon Wallis, 29th Battalion, returned to Australia, 22 March 1917. (Tree No. 3494)
Tree No. 3496