Arthur enlisted on 7th April 1913. He was 18 years and 1 month old, and was a Clerk by trade. He entered the war in France on 13th August 1914 as part of the Regimental Medical Officer's team for the 1st Bn. Irish Guards. He served with the British Expeditionary Force until 23rd April 1917. From 7th November to 19th December 1917 he was a patient under the care of the 1st Southern General Hospital, Birmingham suffering with shell shock. He was discharged on 21st June 1918.