George McClellan at Battle of Antietam
George Brinton McClellan (December 3, 1826 – October 29, 1885) was a major general during the American Civil War. He organized the famous Army of the Potomac and served briefly (November 1861 to March 1862) as the general-in-chief of the Union Army.
Coffin, Charles Carleton The Boys of '61; of, Four Years of Fighting. Personal Observation with the Army and Navy (Boston, MA: Estes and Lauriat, 1884)
Courtesy the private collection of Roy Winkelman