Statistics for occurrence #1 of “Vernon rivers” in chapter 8 of Admiral David D. Porter, The Naval History of the Civil War.:

... of Warsaw Sound, and found the fort on Warsaw Island dismantled and the magazine destroyed. An examination of Wilmington River showed heavy works still occupied by the enemy. On the Ogeechee and Vernon rivers heavy earth-works were being erected by the Confederates. Commander Drayton crossed the North Edisto Bar, and found an abandoned earthwork, intended to mount ten guns. In fact, there had been a...
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