During the French and Indian War, at the first battle of Ticonderoga, also known as the Battle of Carillon, the regiment lost over half of its men in the assault in July 1758. At that time they were already officially recognized as a Royal regiment. The second battalion of the Black Watch was sent to the Caribbean but after the losses of Ticonderoga, the two battalions were consolidated in New York. The regiment was present at the second battle of Ticonderoga in July 1759 and the surrender of Montreal in September 1760. They were sent to the West Indies again where they saw action at Havana, Martinique and Guadeloupe.