Commanding Officers at Antietam: MGen Joseph K. F. Mansfield BGen Alpheus S. Williams
Members of Interest: Capt. Clarence H. Dyer, AAG
This Army Corps' Chain of Command: Army - Army of the Potomac
Units which make up this Army Corps: 1st Division, XII Corps 1st Michigan Cavalry, Company L 2nd Division, XII Corps XII Corps Artillery
Battlefield Tablets for this Unit
Tablet #120: Army of the Potomac - 17 Sep, 5 AM to 17 Sep, 12 PMTablet #27: Twelfth Army Corps - 17 Sep, 6 AM to 17 Sep, 12 PM
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