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Commanded by
Brigadier General Philip St. George Cooke (to July 5)
Brigadier General George Stoneman
After the Army of the Potomac was humiliated by Stuart’s ride through its rear area, Cooke (who was Stuart’s father-in-law) was relieved and a cavalry division organized under George Stoneman.
| First Brigade | Colonel W. W. Averill | |
| 1st New York Cavalry Regiment | from 6th Corps | |
| 3rd Pennsylvania Cavalry Regiment | from 3rd Corps | |
| 4th Pennsylvania Cavalry Regiment | from 5th Corps | |
| 5th United States Cavalry Regiment | ||
| 2nd Brigade | Colonel David McM. Gregg (until 7/16) Brigadier General Alfred Pleasonton |
|
| 6th Pennsylvania Cavalry Regiment | Colonel Richard H. Rush | from 1st Brig. |
| 8th Illinois Cavalry Regiment | ||
| 8th Pennsylvania Cavalry Regiment | Major Lawrence Williams | |
| 1st United States Cavalry Regiment | Lt. Colonel William N. Grier | to Army Headquarters |
| 6th United States Cavalry Regiment | from 1st Brig. | |