Here is a book available on the internet, written by a Confederate soldier who fought at Franklin and was captured, spending the rest of the war at Camp Douglas in Chicago.
http://docsouth.unc.edu/fpn/copley/copley.html
John M. Copley
A Sketch of the Battle of Franklin, Tenn.; with Reminiscences of Camp Douglas.
Austin, Tex.: Eugene von Boeckmann, 1893.