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Staff, Headquarters Units and Provost Guard
The Union Army of the Potomac was divided into seven army corps, one cavalry corps, five brigades of reserve artillery, and an engineer brigade. Several infantry and cavalry units were also attached directly to army headquarters.
1st Army Corps - Major General John Reynolds
2nd Army Corps - Major General Winfield S. Hancock
3rd Army Corps - Major General Daniel Sickles
Fifth Army Corps - Major General George Sykes
Sixth Army Corps - Major General John Sedgwick
Eleventh Army Corps - Major General Oliver O. Howard
Twelfth Army Corps - Major General Henry Slocum
Cavalry Corps - Major General Alfred Pleasonton
Artillery Reserve - Brigadier General Robert O. Tyler
Engineer Brigade - Brigadier General Henry W. Benham