Union general (1826–1885) removed from command by Lincoln for his failure to exert pressure on Lee’s army during the crucial Peninsula Campaign. He ran unsuccessfully for the presidency in 1864 and later served as Governor of New Jersey. Ink signature, “In haste very truly yours, Geo. S. McClellan,” on an off-white 3.75 x 1.75 lightly-lined slip. In fine condition, with a bit of trivial toning from mounting remnants on reverse. RRAuction COA.