 By the end of the Great War Moynihan held the rank of major-general in the British Army and had been chairman of the Army Advisory Board from 1916 and chairman of the council of consultants 1916 to 1919.He delivered the Bradshaw Lecture in 1920 and the Hunterian oration in 1927.He served as President of the Royal College of Surgeons of England from 1926 to 1932.