The 84th was tasked with defending British maritime provinces from American Revolutionary attacks by land and sea. Throughout the war, American privateers devastated the maritime economy by raiding many of the coastal communities. There were constant attacks by American privateers, such as the Sack of Lunenburg, Nova Scotia (1782), numerous raids on Liverpool, Nova Scotia (October 1776, March 1777, September, 1777, May 1778, September 1780) and a raid on Annapolis Royal, Nova Scotia (1781). There was also a naval engagement with a French fleet at Sydney, Nova Scotia, near Spanish River, Cape Breton (1781).