Following the signing of the Treaty of Paris in 1763 and the end of the war, the regiment moved to a posting at St. Augustine in Florida, where it remained until 1769. In April 1776, the regiment embarked for Canada as part of an expedition under Major-General John Burgoyne and took part in the siege of Fort Ticonderoga and the Battle of Fort Anne in July 1777 during the American Revolutionary War. It surrendered at the Battle of Saratoga in autumn 1777 and its men then spent three years as prisoners of war as part of the Convention Army.