Union general (1816–1870) whose most decisive victory earned him the sobriquet "Rock of Chickamauga.” Ink signature, “Geo. H. Thomas, Maj. Genl. U.S.A,” on an off-white 5.5 x 1.75 slip. The signature of Brigadier General J. H. Martindale is affixed to the reverse. In fine condition, with a touch of mild toning at right edge. R&R COA.