I looked in Ancestry and FamilySearch and I only found his marriage in FS.
You'll find his parents in church birth and marriage records. Also look for a marriage notice in the local newspaper. You might find them in on-line family trees and in his military records and www.findagrave.com
I'd contact the Vicksburg Genealogical Society, www.rootsweb.ancestry.com/~msvgs/
and the Vicksburg District Library/Heritage Room, www.vicksburglibrary.org/heritage-room/
about those items. Successful Searching!