Born in Warrenheip, Victoria and a Clerk at the Victorian Railways, Henry Clark was 26 years and married when enlisted on the 3rd of May 1916 in the Field Artillery Brigade 2, Reinforcement 22, Australian Imperial Force, with the rank of Gunner, Number 30430. His Unit embarked from Melbourne, Victoria, on board HMAT A20 'Hororata' on the 23rd of November 1916. Admitted to the first A.D.H. No. 20 on the 30th of March 1917 and transferred to Parkhouse No. 42 on the 26th of April 1917. On the 11th of September 1917 proceeded overseas to France via Southampton and transferred to 4th DAC ex RBAA England and transferred to the 10th Field Ambulance and again to the 4th DAC on the 4th of December 1917. Appointed Driver on the 13th of December 1917. Embarked return to Australia per 'Pt. Denison' on the 25th of March 1919 and disembarked on the 10th of May 1919. Discharged from the 3rd Military District on the 21st of June 1919 with the Termination of Period of Enlistment. Tree No. 3434