Statistics for occurrence #1 of “St. John's river” in chapter 5 of Col. J. J. Dickison, Confederate Military History, a library of Confederate States Military History: Volume 11.2, Florida:

...ions of general orders from the adjutant and inspector's office, Tallahassee, July 30th. After the fight at Palatka, Company H, Second Florida cavalry, continued to perform heavy picket duty on the St. John's river , frequently engaging in skirmishes with the enemy. On the morning of August 15th a simultaneous movement was made by the Federals from Jacksonville and Green Cove Springs with a force of about 5,00...
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St. John's River (Missouri, United States) 5 0 3 0 0 user votes

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