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Commanded by: Brigadier General Darius N. Couch

Formerly known as Keyes’ Division. On March 3 General Keyes was given command of the newly created 4th Corps. His division became the 1st Division of the Corps under senior brigadier Darius Couch.

First Brigade Colonel Henry S. Briggs
7th Massachusetts Infantry Regiment Colonel David A. Russell
10th Massachusetts Infantry Regiment
36th New York Infantry Regiment Colonel Charles H. Innes
2nd Rhode Island Infantry Regiment Colonel Frank Wheaton
Second Brigade Brig. Gen. L. P. Graham
65th New York Infantry Regiment Colonel John Cochrane
67th New York Infantry Regiment Colonel Julius W. Adams
23rd Pennsylvania Infantry Regiment Colonel David B. Birney
61st Pennsylvania Infantry Regiment Colonel Oliver H. Rippey from Heintzelman’s Div., 3 Brig.
82nd Pennsylvania Infantry Regiment Colonel David H. Williams
Third Brigade Brig. Gen. J. J. Peck
55th New York Infantry Regiment Colonel Philip R. DeTrobriand
62nd New York Infantry Regiment Colonel John L. Riker
93rd Pennsylvania Infantry Regiment Colonel James M. McCarter
98th Pennsylvania Infantry Regiment Colonel John F. Balier
102nd Pennsylvania Infantry Regiment Colonel Thomas A. Rowley
 Artillery
Battery C, 1st Pennsylvania Artillery
Battery D, 1st Pennsylvania Artillery
Battery E, 1st Pennsylvania Artillery
Battery H, 1st Pennsylvania Artillery