Andrew J. Prewitt enlisted as a Private, age 21, May 29, 1861 in Company I, 15th Mississippi Infantry, at Cornith , Mississippi, traveling 210 miles to rendezvous, 3rd Sergeant was captured at Vicksburg, July 4, 1863, paroled with his unit July 10 1863, subsequent records show he never returned to the regiment.
See http://www.usgennet.org/usa/ms/county/attala/15thmscoIroster%5B5%5D.htm & http://www.choctawgrays.com/links.html
Also: 15th Mississippi, "A Hard Trip, A History of the Fifteenth Infantry, CSA,".by Ben Wynne. Published by Wynne Mercer University Press. Book is 252 pages
His 17 card record file may be obtained through the service noted above.