Statistics for occurrence #1 of “Folly islands” in chapter 4.23 of Southern Historical Society Papers, Volume 2.:

...nd aided by a demonstration in force on the Charleston and Savannah Railroad in the vicinity of Adam's Run. Accordingly, at daydawn on the 2d July, several regiments crossed over from Morris' and Folly islands to the south end of James' island, and after a sharp skirmish drove in our pickets and captured two field-pieces. At the same tine two monitors and several gunboats steamed up the Stone river above...
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