Thomas enlisted on 25th August 1910. He was 24 years and 4 months old, and was a Bookbinder by trade. Stationed in Aldershot at the outbreak of war, he was mobilized to serve with the 2nd Field Ambulance, entering the war in France, with the unit, on 19th August 1914. Capt W J E Bell, who was in command of the bearer Div during the operations commencing 9th May 1915, stated that on 21st May 1915 two Bearer subdivisions proceeded to Beuvry in relief of the bearers of No 3 Field Ambulance but Beuvry was heavily shelled in the evening, and after 10 p.m. one shell struck the school that was being used as a dressing station; there were no wounded in the dressing station at the time but one member of the RAMC was killed and five were wounded. Thomas was one of the wounded, receiving a shell wound to his left thigh, and left knee and hip. He was evacuated back to the UK, via No 1 Stationary Hospital, arriving back on 29th May 1915. Thoams returned to the BEF in France on 6th November 1916. On 25th April 1918 he was serving with the 63rd Field Ambulance, having gone missing, he rejoined on 6th June 1918. On 23rd April 1919 he joined ‘A’ Coy in Aldershot, having returned to the UK from serving with No 46 Casualty Clearing Station in France. He then proceeded to Southampton on 12th May 1919 to embark for Archangel. He disembarked in Archangel on 27th May, and was posted to serve with No 53 Stationary Hospital. He was shortly after admitted into hospital suffering with Myalgia and was discharged back to the UK on 28th July. His service ended on 1st September 1919.