The success of rebels in the American Revolutionary War led to another change in parties in the region. Great Britain formally ceded Fort Mackinac at Mackinac Island to the newly independent United States in the Treaty of Paris in 1783, but the British Army refused to evacuate the posts on the Great Lakes until 1796. At that time, they transferred the forts at Detroit, Mackinac, and Niagara to the Americans. British and American forces contested the area again throughout the War of 1812. The boundary was not settled until 1828, when Fort Drummond, a British post on nearby Drummond Island, was evacuated.