Statistics for occurrence #1 of “Sullivan's Island” in chapter 1.8 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War. Volume 4.:

... Sullivan's Island
by Quincy A. Gillmore, Brevet Major-General, U. S. A. Charleston Harbor somewhat resembles the harbor of New York in general...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Sullivan's Island (South Carolina, United States) 1,044 60 6 0 0 user votes
Sullivan's Island (South Carolina, United States) 0 0 0 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.