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

...oultrie was Battery Marion, and another work, called Battery Rutledge, was close to Fort Moultrie on the east. Secessionville, near the center of James Island, will be found on the map of James and Folly islands . When Cumming's Point was evacuated by the Confederates, Battery Gregg was named Putnam, after Colonel Haldimand S. Putnam, and a work east of Battery Gregg, and facing the main channel, was called...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  

† 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.