Statistics for occurrence #1 of “St. Mary's River” in entry florida of Harper's Encyclopedia of United States History:

... The Florida insurgents planted the standard of revolt, March, 1812, on the bluff opposite the town of St. Mary, on the border line. Some United States gunboats under Commodore Campbell were in the St. Mary's River , and Mathews had some United States troops at his command near. The insurgents, 220 in number, sent a flag of truce, March 17, to Fernandina, demanding the surrender of the town and island. About...
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St. Mary's River (United States) 0 0 0 0 0 user votes

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