In May 1760, Morris was promoted to lieutenant-colonel of the 47th Regiment of Foot shortly after the Battle of Sainte-Foy, and participated in General Jeffery Amherst's assault and capture of Montreal on 8 September 1760 ending French rule in North America.
In May 1760, Morris was elevated to lieutenant-colonel of the 47th Regiment of Foot shortly after the Battle of Sainte-Foy, and participated in General Jeffery Amherst's assault and capture of Montreal on 8 September 1760, bringing an end to French dominance in North America.