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Commanded by Brigadier General Silas Casey

Casey’s Division was assigned to the 4th Corps as its 3rd Division on March 3, 1862.

First Brigade Brig. Gen. Henry M. Naglee 
11th Maine Infantry Regiment Colonel John C. Caldwell
56th New York Infantry Regiment Colonel Charles H. Van Wyck
100th New York Infantry Regiment Colonel Charles H. Van Wyck  from New York City 3/10
52nd Pennsylvania Infantry Regiment Colonel John C. Dodge
104th Pennsylvania Infantry Regiment Colonel William W.H. Davis
Second Brigade Brig. Gen. William H. Keim
59th New York Infantry Regiment  Colonel William L. Tidball  to Defenses Washington
86th New York Infantry Regiment  Colonel Benjamin P. Baily  to Defenses Washington
96th New York Infantry Regiment Colonel James Fairman
85th Pennsylvania Infantry Regiment  Colonel Joshua B. Howell
101st Pennsylvania Infantry Regiment  Colonel Joseph H. Wilson from Harrisburg 2/24
103rd Pennsylvania Infantry Regiment  Colonel Theodore F. Lehmann from Harrisburg 2/27
Third Brigade Brig. Gen. Innis N. Palmer
81st New York Infantry Regiment Colonel Edwin Rose from New York 3/5
85th New York Infantry Regiment Colonel Jonathan S. Belknap
92nd New York Infantry Regiment Colonel Jonah Sanford from New York 3/5
93rd New York Infantry Regiment Colonel John S. Crocker from New York 3/7
98th New York Infantry Regiment Colonel William Dutton from New York 3/8
Artillery
Battery A, 1st New York Artillery
Battery H, 1st New York Artillery
7th New York Independent Battery
8th New York Independent Battery