Union general whose most decisive victory earned him the sobriquet "Rock of Chickamauga.” Large war-date DS, signed “Geo. H. Thomas, Maj. Genl, U.S.A,” one page, 17 x 14, June 1862. A partially printed “Roll of Non-Commissioned Officers and Privates Employed on Extra Duty as Mechanics and Laborers in the Field,” listing twenty men with rank, company, regiment, job description, rate of pay, and more. Accompanied by an unsigned 1866 portrait engraving. In fine condition, with mild toning, usual folds, and two small stains, none of the above affecting the signature. R&R COA.