He joined the 44th Regiment of Foot as an ensign on 31 October 1792, and was promoted to lieutenant on 31 January 1794.
[1] He returned to England in 1802 and was appointed major in the 44th on 15 June 1804 and served in Guernsey, Malta, and Sicily.
[2] A non-commissioned officer, Sergeant Ryan, brought his injured and unconscious commander to the surgeons.
After a slow recovery he returned home and shortly afterwards was nominated a Companion of the Bath as well as given the Waterloo Medal.
[1] Hamerton married Helena, daughter of J. Sullivan and the couple had the following issue:[1][4] He died on 27 January 1855 at Orchardstown House, near Clonmel, Ireland after a short illness and was interred in the family vault at Rathronan.