Anyone have more information on the 31st LA Infantry? My gg grandfather was captured at Vicksburg, and died shortly thereafter.

1863 -WILSON M V PVT 31ST LA INF C received a field parole after the capture of Vicksburg
abt 4 Jul 1863 Born in East Feliciana Parish, LA, age 35, a farmer, enlisted 14 May 1862 at Delphi, Carrol Par, La. Captured at Vicksburg