Captain John D O’Brian was in command of the 24th New York Infantry at Antietam as senior officer on the field. He was seriously wounded there and lost his leg to amputation. His photograph is from the New York State Military Museum.

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Clippings from the Fox Lake (WI) Gazette of 2 October 1862 listing Wisconsin soldiers in Maryland hospitals, those recently died in Washington, DC, and those buried near the Maryland battlefields. Last listed among the hospitalized in column 1 was 20 year old Corporal Arthur D. Hamilton who was mortally wounded at Antietam. He died in a hospital in Keedysville, MD on 26 September 1862.

A photograph at the Library of Congress of Colonel William H. Pettes. He commanded the 50th New York Engineers. Although nominally attached to the Army of the Potomac, they were not in the field on the Maryland Campaign, but were detailed to Washington, DC on 7 September 1862.

This fine Brady portrait photograph of the General and his wife is in the Library of Congress. A career US Army officer, West Point ’39, Brigadier General James B Ricketts commanded the 2nd Division in the First Army Corps at Antietam. He was injured there when his horse fell on him, but remained with his command.

Brigadier General Fitzhugh Lee (nephew of R.E. Lee) commanded a Brigade of Cavalry on the 1862 Maryland Campaign. This carte-de-visite of him is in the collection of the Library of Congress.