The 1st Battalion had returned to the West Indies as a garrison in 1790, and served there until 1797, with a brief period of combat in the Haitian Revolution. The West Indies were hotbeds of disease, and the battalion lost more than half its strength to disease in this period. It was reformed from militia volunteers in Ireland in 1798: This year saw a major rebellion erupt in Ireland after years of simmering tension. The Lothian Fencibles fought with distinction at the Battle of Vinegar Hill, one of the more important engagements of the rebellion. Subsequently, the regiment gained a new regimental song: