Alexander had previously served with the Army Service Corps, then transferred to the R.A.M.C., joining them in Aldershot on 28th April 1912. He was 19 years and 7 months old at the time, and was a Sheet Iron worker by trade. He entered the war in France on 19th August 1914 with the 2nd Field Ambulance. On 20th June 1915 he was sentenced to 14 days Field Punishment No 1, but shortly after returning to duty was admitted to hospital on 4th July 1915 due to sickness. After recovering in No 9 Stationary Hospital he was sent, on 11th August 1915, to Base Details in Rouen. From there he was posted to the A.D.M.S., 14th Division, who sent him to serve with the 44th Field Ambulance. On 23rd March 1917 he was admitted into his unit with a wound to his right eye. He was evacuated back to No 37 Casualty Clearing Station, then to No 6 Stationary Hospital, and onto No 20 20 General Hospital via Ambulance Train. He remained there until 20th April when he was evacuated back to the UK. He served in Blackpool from 21st April 1917 to 12th May 1919, when he was discharged from the army as no longer physically fit due to the loss of an eye. He was the son of Thomas Arthur and Margaret Arthur of 3 Branfield Street, Edinburgh.