You can procure his records from a service provided by these message boards, see:
http://history-sites.com/research/

John Williams, Private, Company D, 2nd Regiment Louisiana Infantry,* enlisted February 10, 1863 at Mansfield, La. by Capt. Ashton for 15 months, detailed as Regimental Teamster May/June, 1863, admitted Receiving and Wayside Hospital March 29, 1864, transferred to La. hospital March 30, admitted C. S. A. General Hospital, Charlottesville, Va. June 1, 1864, Chro. Rheumatism, transferred June 18 to Convalescent Camp, receipted for an issue of clothing December 8, 1864, admitted Louisiana Hospital, Richmond, Va., December 27, 1864, discharged as overage February 10, 1865, description on enlistment: age 47, born in Tuscaloosa County, Ala., 6’ 0”, fair complexion, blue eyes, dark hair

* This company was successively designated as Company I, Company K, Company A and Company D, 2nd Regiment Louisiana Infantry

M320: Compiled Service Records of Confederate Soldiers Who Served in Organizations from the State of Louisiana