[Anscojohn]

I like Bill's suggestion. It looks like the moustache in the fourth and eleventh images and the uniform of the ninth image on this page, and he's got two stars--

http://learn.bowdoin.edu/joshua-lawr...erlain/photos/

*******
It does look a bit like Chamberlain; but Chamberlain would have been much younger as a Brigadier General of Volunteers and was mustered out as a Major-General of Volunteers.