Statistics for occurrence #1 of “Sullivan's” in chapter 1.1 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War. Volume 4.:

...ut the 10th of July, 1863, the Confederate forces available for the defense of the exterior lines of Charleston did not exceed 6500 men, distributed to the best advantage for the protection of James, Sullivan's , and Morris islands, and of the city proper; whereas General Gillmore had at that time, according to his own estimate, 11,000 men, whom he might have easily concentrated against any special point. ...
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