In 1756 the regiment departed for Canada and fought against the French at the Battle of Carillon in July 1758 and the Battle of Ticonderoga in July 1759. The following year, the regiment took part in the successful three pronged attack against Montréal in September during the Seven Years' War. It then took part in the Invasion of Martinique in January 1762 and the capture of Grenada in February 1762. It also took part in the Battle of Havana in June 1762 during the Anglo-Spanish War: the regiment suffered heavy losses and was evacuated to New York. In August 1767 the regiment returned to Ireland.