United States Army

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Commanded by Major General George B. McClellan

On March 3, 1862, President Lincoln created the first five army corps in the Army of the Potomac and appointed their commanders. This was done despite the protests of General McClellan, who wanted to delay until he had judged his division commanders in battle.

First Corps Major General Irvin McDowell
First Division Brig. Gen. Willliam B. Franklin
Second Division Brig. Gen. George A. McCall
Third Division Brig. Gen. Rufus King
Second Corps Brigadier General Edwin V. Sumner
First Division Brig. Gen. Israel B. Richardson
Second Division Brig. Gen. John Sedgwick
Blenker’s Division Brig. Gen. Louis Blenker transferred to Dept. Mountains 3/31
Third Corps Brigadier General Samuel P. Heintzelman
First Division Brig. Gen. Fitz John Porter
Second Division Brig. Gen. Joseph Hooker
Third Division Brig. Gen. C. S. Hamilton
Fourth Corps Brigadier General Erasmus Keyes
First Division Brig. Gen. Darius N. Couch
Second Division Brig. Gen. William F. Smith
Third Division Brig. Gen. Silas Casey
Fifth Corps Major General Nathaniel P. Banks
First Division Brig. Gen. Alpheus S. Williams
Second Division Brig. Gen. John Shields
Cavalry Command Brig. Gen. John P. Hatch
Cavalry Reserve Brigadier General Philip St. George Cooke
First Brigade Colonel William H. Emory
Second Brigade Colonel George A. H. Blake
Artillery Reserve Colonel Henry J. Hunt
Military District of Washington Brigadier General James Wadsworth