Federal Corps

First (I) Army Corps

Commanding Officers on the Antietam Campaign:
  Joseph Hooker
  George Gordon Meade

Members of Interest:
  Major Davis Tillson, Chief of Artillery;
  Surg. J.T. Heard, Medical Director (acting)

Others of General Hooker's Staff:
  Major Joseph Dickinson, assistant adjutant-general;
  Maj. William H. Lawrence, aide-de-camp;
  Capt. William L. Candler, aide-de-camp;
  Capt. Alexander Moore, aide-de-camp.

This Army Corps' Chain of Command:
  Army - Army of the Potomac

Units which make up this Army Corps:
  1st Division, I Corps
  2nd Division, I Corps
  3rd Division, I Corps
  Companies A, B, I, & K, 2nd New York Cavalry