Statistics for occurrence #1 of “Sullivan's” in chapter 6 of Alfred Roman, The military operations of General Beauregard in the war between the states, 1861 to 1865:

...er, but fearing the eventual reduction of that work and the result which must ensue for Battery Gregg and Fort Sumter, General Beauregard determined to modify and increase his inner circle of fire on Sullivan's and James Islands, and to erect a work on Shell Point—James Island—wherewith to sweep the front of Battery Wagner, and assist in checking the further progress of the enemy on Morris Islan...
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