President Lincoln on battle-field of Antietam, October, 1862. Photograph shows Abraham Lincoln at Antietam, Maryland, on Friday, October 3, 1862, during his visit to General McClellan, commander of the Army of the Potomac, to encourage Little Mac to attack the Confederate Army. Lincoln is posed standing by a chair and facing McClellan with other Union Army officers grouped outside a tent. From left to right: Colonel Delos B. Sacket, Captain George Monteith, Lieutenant Colonel Nelson B. Sweitzer, General George W. Morell, Colonel Alexander S. Webb Chief of Staff, 5th Corps, General George B. McClellan, Scout Adams, Dr. Jonathan Letterman Army Medical Director, unidentified soldier, President Abraham Lincoln, Colonel Henry J. Hunt, General Fitz-John Porter, Joseph C. G. Kennedy, Colonel Frederick T. Locke, General Andrew A. Humphreys, and Captain George Armstrong Custer. (Source: Ostendorf, p. 107). Date 1866.