He enlisted and joined the Royal Field Artillery as a Gunner (Service No. 83321). He was posted to Egypt and served with the 68th Brigade, rising to the rank of Bombardier. Whilst there he was hospitalized with dysentry and piles. He was transferred to France and Flanders where he joined the 86th Brigade. On 21st March 1918 the Germans had launched their Spring Offensive in the Somme area near Saint-Quentin. Whilst the offensive did not succeed, Walter was taken prisoner on the 21st Mar 1918 at Templeux-Le Guerard, a nearby village. He was held in a Prisoner of War camp at Parchin, Germany, until the end of hostilities. He was repatriated and eventually discharged and awarded the Victory and British War medals as well as the 1915 Star. He promptly re-enlisted on 10th June 1919 and joined the Royal Army Service Corps as a Corporal (Service No. A/451055). He was finally discharged under Kings Regulation 322 (XXV) as being surplus to requirements on 10th May 1920.
At the time of the 1939 Registry he was living at 34 Constantine Road, Hampstead, London, was single, and working as a Civil Service Clerk at the Ministry of Supply. His death was recorded at the Hammersmith, London, Registry in 1964. His brother, Francis Hannen Buckland, also served in the conflict.