Hugh Sergeant was born at Stone (Scotland?) about 1729. He enlisted at the age of 24 in 1753. He listed his occupation as an unskilled laborer. He was the senior sergeant of the Grenadier Coy when the Royal Irish arrived at Philadelphia in July 1767. Sergeant was sent on command to Ft. Pitt with Cpt. Edmonstone, his company commander at the time, sometime in the early fall. He was still on command when the Royal Irish were inspected in October 1767.
Sergeant remained with the Grenadier Coy throughout its Illinois service being posted at Ft. Chartres, Cahokia and returning to Philadelphia with the Grenadiers. When the Royal Irish returned to Philadelphia in late 1772, the regiment was significantly reduced in strength, so a recruiting party was to be sent to England. Lt. Bewes of the Grenadier Coy was to command the party. Sergeant was sent as his second in command. However, to reduce the impact on the Grenadier Coy, Sergeant was transferred to Cpt. Robert Hamilton’s battalion coy. He never really served in Hamilton’s Coy as he remained on recruiting duty for the next two years. He was originally transferred to Hamilton’s Coy on 27 January 1773 and was still listed on recruiting duty on 8 February 1775.
He returned to the Royal Irish at Boston most likely in June 1775. At that time, he was posted to Cpt. Richardson’s Coy and was present with the company when they were mustered for pay at Boston on 2 October 1775. Sergeant returned to England with the cadre of the regiment in February 1776. He was discharged and recommended Chelsea Hospital that summer. He was interviewed by the Chelsea Board on 16 August 1776 and was admitted as an out pensioner as having been worn out in His Majesty’s Service.