Statistics for occurrence #1 of “Charleston harbor” in chapter 1.2 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War. Volume 4.:

...ing with the smoke and smell of powder, Fort Sumter under fire was transformed within a year into a powerful earth-work, impregnable to assault, and even supporting the other works at the entrance of Charleston harbor with six guns of the heaviest caliber. Thus it was not until February, 1865, a few months only before the war came to an end, that General Sherman's march through the interior of South Carolina o...
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Entity Corpus Doc Corpus Doc  
Charleston Harbor (South Carolina, United States) 1,700 20 36 0 0 user votes

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