Got a question for you history types. Civil War related. I have a picture of a fellow, clearly in officer garb, but is listed in all sources as enlisting as a Private, and mustering out as a Private. Any possible explanations, other than the guy in the picture is NOT the same as the name attached to it. It's always a possibility, but I don't know enough about ranks, whether it may have been a field brevet, or whatever. And the fellow doesn't really look old enough for the picture to have been post-war, though he was a GAR member (he was born in 1831).
Thanks for any insight!