Statistics for occurrence #1 of “Charleston harbor” in chapter 39 of Admiral David D. Porter, The Naval History of the Civil War.:
... the obstacles then presented.
The South Atlantic squadron, during the year 1863, had performed most valuable service in blockading the Southern coast, and had succeeded in maintaining a force in Charleston harbor which completely closed that port as a refuge for blockade-runners, and prevented the Confederates from obtaining further supplies in that quarter.
The Navy Department had made great efforts to c...
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