Commanding Officer at Antietam:
MGen John E. Wool
This Army Corps' Chain of Command:
An administrative area consisting of the States of New Jersey, Pennsylvania, Delaware and the Eastern Shores of Maryland and Virginia, and the Maryland Counties of Cecil, Harford, Baltimore and Ann Arundel. Designated the 8th Army Corps July 22, 1862. Headquarters at Baltimore, Maryland.
References & Notes
Organizational details from Dyer1