On 10 November 1917 St Maur Carter was sent to the Italian Front and was attached to XIV Corps H.Q., which was based at Mantua, South of Milan, although with the Italian crisis over he returned to Western Front again where he remained until the end of the war. After the war in 1918 he was sent to India and was based at Army H.Q., where he helped co-ordinate the British and Indian Medical Services employed during the Third Afghan War. He then returned to the UK in 1923 and took up a position with Aldershot Command again as a senior specialist surgeon.