Herbert enlisted into the R.A.M.C. (T.F.) on 4th September 1915, and was embodied into the Wessex Divisional Sanitary Section. He was 33 years and 4 months old, and was living at 1 St Peters Terrace, Ilfracombe at the time. On 18th September 1915, he gained promotion to temporary acting Serjeant, and then gained further promotion to Staff Serjeant on 9th October 1915. Herbert left the UK for Mesopotamia on 17th September 1916, and entered war the following 17th October. He returned to the UK on 9th March 1919 and was disembodied on 28th May 1919.