A Colonel at Gettysburg and Spotsylvania by Varina Davis Brown has as Captains for Gregg's First Regiment, SC Volunteers, Company G. (Hamburg, Edgefield District), Andrew Pickens Butler and Wiley H. Holloway.

The books states that this list was taken from A.S. Salley's book, South Carolina Troops in Confederate Service, Volume I, pages 215, 216, 220, 398.