Mackinac Island Battlefield 1814

Source

Fort Holmes

This Fort was built while the British held possession of the Island in 1812 and 1814.  It was called by the British Fort George; in honor of the British king, afterward rechristened by the Americans in honor of Maj. Andrew Hunter Holmes, who was killed August 4, 1814, during an unsuccessful attempt by the Americans to regain possession of Fort Mackinac.  [Annals of Fort Mackinac]

Canada's Fort St. Joseph

In 1796 it [Fort Mackinac] was handed over to the United States to fulfill a clause in Jay's treaty of 1794 and consequently the British garrison was removed to the Island of St Joseph.

In the fall of 1801 a detachment of the Queen's Rangers was ordered to Fort St Joseph, a post on the island of the same name near the head of Lake Huron.  [Source]

See a modern day map here.  Bicentennial celebrations mentioned here.