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The Army constructed Fort Gratiot in 1814 as an outpost to guard the juncture of the Saint Clair River and Lake Huron. The fort took the name of the engineer supervising its construction, Charles Gratiot. Soldiers occupied Fort Gratiot until 1822 and then abandoned the fort. Lucius Lyon built Fort Gratiot Light north of Fort Gratiot in 1825-1829. The Army then returned from 1828.
Soldiers garrisoned Fort Gratiot intermittently through the American Civil War
- Jenks, William A. "Fort Gratiot and Its Builder Gen. Charles Gratiot". In Michigan History Magazine, January 1920, pp. 144-46.
- Gannett, Henry (1905). The Origin of Certain Place Names in the United States. Govt. Print. Off. p. 129.
- Walter Romig, Michigan Place Names, p. 204