Born in Kew, Melbourne, Victoria and an accountant by trade, Donat Walter Barker was 25 years and married when enlisted on the 19th of June 1915 in the 6th Battalion, 16th Reinforcement, Australian Imperial Force, with the rank of 2nd Lieutenant and was listed as returned to Australia. Previous military service includes Ararat Grammar Cadets 2 years, Field Artillery 2 years, 7th A.I.R 1 year. His Unit embarked from Melbourne, Victoria, on board HMAT A23 Suffolk on the 1st of April 1916. Promoted corporal on the 11th of August 1915 and sergeant on the 28th of August 1915. Embarked for active service as 2nd Lieutenant and on the 16th of August wounded in action in France with gunshot wounds hand severe and abrasion left thigh and admitted to St. John's Ambulance Hospital on the 17th of August 1916. Again gunshot wounds mild and admitted to 4th General Hospital on the 26th of August 1916. On the 1st of January 1918 promoted Lieutenant and on the 11th of June 1918 and classified B2 at Medical Board Havre and placed on supernumerary list invalided. Admitted on the 15th of March 1918 to the 14th General Hospital, Boulogne, France suffering from stomatis, severe. Retired on the 1st of December 1928. Tree No. 2090