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

...ensacola. On the 5th of April, 1861, they began their march, a dispatch being forwarded by Theodore W. Brevard, adjutant-general of Florida, that about 580 men belonging to the counties east of the Chattahoochee river would take steamers at that point for Columbus, where transportation and subsistence would be expected. The companies on the west side of the river would march through.
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