lieutenant-general, governor of Jamaica and St. Domingo, born in 1736, was son of Lieutenant-general George Williamson (1707?–1781), who commanded the royal artillery at the siege and capture of Louisburg in 1758 and during the operations in North America terminating in the capture of Montreal in 1760. He became a cadet gunner on 1 Jan. 1748, entered the Royal Military Academy at Woolwich in 1750, and was appointed practitioner-engineer on 1 Jan. 1753. He went to North America in the following year, was engineer in Braddock's ill-fated expedition to Virginia in 1755, and was wounded at the battle of Du Quesne on 9 July.
