Statistics for occurrence #1 of “Sullivan's Islands” in chapter 8 of The Annals of the Civil War Written by Leading Participants North and South:

...nd had a wet ditch. It could only be approached in front over ground that was completely swept by its guns. The guns of Gregg took it in reverse, while those of the enemy's batteries on James and Sullivan's Islands took it both in reverse and flank. The barbette guns of Sumter commanded it by a plunging fire, and threw shells a mile beyond. The operations were carried on along a narrow strip of land less th...
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