Union Order of Battle
Army of the Potomac: Maj. Gen. Joseph Hooker
127,500 men
1st Corps- Maj. Gen. John F. Rynolds (16,908 men)
2nd Corps- Maj. Gen. Darius N. Couch (16,893 men)
3rd Corps- Maj. Gen. Daneil E. Sickles (18,721 men)
5th Corps- Maj. Gen. George Meade (15, 824 men)
6th Corps- Maj. Gen. John Sedgwick (23,667 men)
11th Corps- Maj. Gen. Oliver O. Howard (12,977 men)
12th Corps- Maj. Gen. Henry W. Slocum (13,450 men)
Cavalry Corps- Brig. Gen. George Stoneman (9,060 men)