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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