Union general (1816-1870) whose most decisive victory earned him the sobriquet 'Rock of Chickamauga.' Uncommon 2.25 x 4 carte-de-visite half-length portrait of Major General George H. Thomas in his two-star military uniform, signed in the lower border in ink, "Geo. H. Thomas, Maj. Genl U. S. A." Published by Morse's of Nashville, Tennessee, with reverse bearing a date notation of February 15, 1865. In very good to fine condition, with some light scuffing to the image background. Encapsulated in a PSA/DNA authentication holder.