Lincoln’s difficult general
Maj. Gen. George B. McClellan snubbed and acted insubordinately toward President Lincoln on numerous occasions. Lincoln suffered the insults as long as McClellan produced results. But when McClellan failed to follow up his success at Antietam, despite Lincoln’s direct order, this general order announced to the U.S. Army that McClellan had been relieved of his command.
National Archives, Records of the Adjutant General’s Office