It appears we have a match -
Pvt. George Allen of Carthage, Leake County, MS appears on a final surrender roll as a member of Company D, Wood's Cavalry Regiment.

Lynn Hartt was looking for any Confederate service for her ancestor in this thread -
http://history-sites.com/cgi-bin/bbs53x/mscwmb/webbbs_config.pl?read=18176