Photograph of the War in the West. Original & with added color by Photoshop

This photograph is of Hood before Nashville. Continuing his policy of the offensive at any cost, Gen. John B. Hood brought his reduced army before the defenses of Nashville, where it was overthrown by Gen. George H. Thomas on December 15-16, in the most complete victory of the war. If the date borne on this photograph is correct, it was taken in the course of the battle.

source http://www.loc.gov/pictures/item/cwp2003004943/PP/