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.
Morris was elevated to lieutenant-colonel of the 47th Regiment of Foot in May 1760, following the Battle of Sainte-Foy. He then played a key role in General Amherst's successful campaign to capture Montreal on September 8, 1760, marking the end of French control over North America.