Statistics for occurrence #1 of “Folly Island, S. C.” in chapter 31 of Frederick H. Dyer, Compendium of the War of the Rebellion: Regimental Histories:

...ed to District of Norfolk and Portsmouth, Va., Dept. of Virginia and North Carolina, to February, 1864. (A Detachment transferred with African Brigade from Dept. of Virginia and North Carolina to Folly Island, S. C. , 10th Army Corps, Dept. of the South, July 29-August 9, 1863, and engaged in operations on Folly and Morris Islands against Fort Sumpter and Charleston, S. C., till December, 1863. Designation of...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Folly Island, S. C. (South Carolina, United States) 799 228 167 140 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.