United States Army > Army of the Potomac
< to August • September 1862 • to October >
Commanded by Brigadier General Fitz John Porter
| First Division | Brigadier General George W. Morrell | |
| First Brigade | Colonel James Barnes | |
| Second Brigade | Brigadier General Charles Griffin | |
| Third Brigade | Colonel H. S. Lansing (until 9/18) Colonel T. B. W. Stockton |
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| Second Division | Brigadier General George Sykes | |
| First Brigade | Lieutenant Colonel R. C. Buchanan | |
| Second Brigade | Lieutenant Colonel William Chapman | |
| Third Brigade | Colonel Gouverneur K. Warren (BG 11/26) | |
| Third Division | Brigadier General Andrew A. Humphreys | |
| First Brigade | Brigadier General E. B. Tyler | recreated 9/12 |
| Second Brigade | Colonel P. H. Allabach | |
| Artillery Reserve | ||
| First Brigade Horse Artillery | to Cavalry Division | |
| Second Brigade | broken up to 3, 5 & 9 Corps | |
| Third Brigade | to 5 Corps Reserve Artillery | |
| Fourth Brigade | to 6 Corps | |
| Fifth Brigade | broken up to 3 & 9 Corps | |