Kathy,

From what I have been able to find out it appears there was also a parole camp at Enterprise, MS. This would explain a person being there after the fall of Vicksburg.

Samuel House Civil War Letters
Collection Guide. Samuel House Civil War Letters. Date Range: 1862-1865. 26 items. Scope and Content: Photostats of letters by Samuel House, Co. L. ... was parolled July 7, 1863-was taken to parole camp at Enterprise, Miss. Later to Demopolis, Alabama & was exchanged Dec ...
www.fsu.edu/~speccoll/civwar/shoucoll.htm

Hope this helps.

Larry Hammack