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Commanded by Major General George B. McClellan
In September of 1862 most of the Army of the Potomac returned from the Virginia Peninsula to the Washington area. One division of the Fourth Corps was left behind and transferred to the Department of Virginia, while its other division was transferred to the 6th Corps. The three corps of the Pope’s badly defeated Army of Virginia merged into the Army of the Potomac as its First, Eleventh and Twelfth Corps. Thousands of new recruits joined, sometimes in entire brigades of raw and inexperienced men. The ink on the orders of new organization was not even dry before the army marched out of Washington on the campaign that culminated in the Battle of Antietam, the bloodiest single day in Civil War history.
Headquarters & Staff |
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| Headquarters Staff | ||
| Chief of Staff | Brigadier General Randolph B. Marcy | |
| Chief of Artillery | Brigadier General Henry J. Hunt | |
| Chief of Cavalry | Brigadier General John Buford | |
| Chief Engineer | Captain James C. Duane | |
| Inspector General | Colonel Delos B. Sacket | |
| Assistant Adjutant General | Lieutenant Colonel Albert V. Coburn | |
| Chief Quartermaster | Lieutenant Colonel Rufus Ingalls | |
| Topographer | Captain Charles R. Lowell | |
| Medical Director | Surgeon Jonathan Letterman | |
| Chief of Signals | Major Albert J. Meyer | |
| Guards & Orderlies | Captain James B. McIntyre | |
| McClellan Dragoons (Illinois) | ||
| Sturgis (Illinois) Rifles | ||
| Oneida (New York) Cavalry Company | Captain Daniel P. Mann | |
| 1st United States Cavalry, Cos. BCH&I | Captain Marcus A. Reno | |
| 4th United States Cavalry, Cos. A & E | Captain James B. McIntyre | |
| Provost Guard | Major William H. Wood | |
| 93rd New York Infantry, Cos. AFH&K | Lieutenant Colonel Benjamin C. Butler | |
| 8th United States Infantry, Cos. ABDF&G | Captain Royal T. Frank | |
| 19th United States Infantry Cos. G&H | Captain Edmund L. Smith (Co. G) Captain Henry S. Welton (Co. H) |
|
| 2nd United States Cavalry Regiment | Captain George Gordon | |
| Engineer Brigade | Brigadier General Daniel Woodbury | |
| 15th New York Engineer Regiment | Colonel John M. Murphy | |
| 50th New York Engineer Regiment | Lieutenant Colonel William H. Pettes | |
| Regular Engineer Battalion | Captain James C. Duane | |
First Corps |
Major General Joseph Hooker (w 9/17) Brigadier General George Meade (to 9/29) Brigadier General John F. Reynolds |
|
| 1st Division | Brigadier General Rufus King Brigadier General J.P. Hatch (w 9/14) Brigadier General Abner Doubleday |
recreated from Army of Virginia, 3rd Corps |
| 2nd Division | Brigadier General J. B. Ricketts | |
| 3rd Division | Brigadier General George Meade (to 9/17) Brigadier General Truman Seymour (to 9/29) Brigadier General George Meade |
|
Second Corps |
Major General Edwin V. Sumner | |
| 1st Division | Brigadier General Israel Richardson (mw 9/17) Brigadier General John C. Caldwell (9/17) Brigadier General Winfield S. Hancock |
|
| 2nd Division | Brigadier General John Sedgwick (w 9/17) Brigadier General Oliver O. Howard |
|
| 3rd Division | Brigadier General William H. French | created 9/10 |
Third Corps |
Major General Samuel P. Heintzelman | |
| 1st Division | Brigadier General Philip Kearney (k 9/1) Brigadier General David B. Birney (to 9/13) Brigadier General George Stoneman |
|
| 2nd Division | Brigadier General Joseph Hooker (to 9/5) Brigadier General Daniel Sickles |
|
Fourth Corps |
Brigadier General Erasmus Keyes | |
| 1st Division | Brigadier General Darius N. Couch | to 6th Corps 9/26 (below) |
| 2nd Division | Brigadier General J. J. Peck | to Dept. of Virginia 9/26 |
Fifth Corps |
Major General Fitz John Porter | |
| 1st Division | Brigadier General George W. Morrell | |
| 2nd Division | Brigadier General George Sykes | |
| 3rd Division | Brigadier General Andrew A. Humphreys | recreated 9/12 |
Sixth Corps |
Major General William B. Franklin | |
| 1st Division | Brigadier General Hennry W. Slocum | |
| 2nd Division | Brigadier General William F. Smith | |
| 3rd Division | Brigadier General Darius N. Couch | from 4th Corps 9/26 (above) |
Ninth Corps |
Major General Ambrose Burnside (to 9/3) Major General Jesse Reno (9/3 – mw 9/14) Brigadier General Jacob D. Cox |
|
| 1st Division | Brigadier General Israel I. Stevens (k 9/1) Colonel B. C. Christ (to 9/8) Brigadier General Orlando Wilcox |
|
| 2nd Division | Major General Jesse Reno (to 9/3) Brigadier General Samuel D. Sturgis |
|
| 3rd Division | Major Gen. J. G. Parke (to 9/3) Brigadier General I. P. Rodman (mw 9/17) Major General John G. Parke |
|
| Kanawha Division | Brigadier General J. D. Cox (^ 9/14) Colonel Eliakim Scammon |
from Dept. West Virginia |
Eleventh Corps |
Major General Franz Sigel | |
| 1st Division | Brigadier General Julius H. Stahel | created 9/12 from Army of Virginia, 1st Corps |
| 2nd Division | Brigadier General Adolph Von Steinwehr | |
| 3rd Division | Brigadier General Carl Schurz | |
Twelfth Corps
|
Major General J. F. K. Mansfield (mw 9/17) Brigadier General Alpheus S. Williams |
|
| 1st Division | Brigadier General Alpheus Williams (to 9/17) Brigadier General Samuel W. Crawford (w 9/17) Brigadier General George Gordon |
created 9/12 from |
| 2nd Division | Brigadier General George Greene | |
Cavalry Division |
Brigadier General George Stoneman (to 9/13) Brigadier General Alfred Pleasonton |
|
| 1st Brigade | Colonel William W. Averill (to 9/13) Major C. Whiting |
|
| 2nd Brigade | Brigadier General Alfred Pleasonton (to 9/13) Colonel John F. Farnsworth |
|
| 3rd Brigade | Colonel Richard H. Rush | |
| 4th Brigade | Colonel A. T. McReynolds | |
| 5th Brigade | Colonel Benjamin F. Davis | |
| Bayard’s Brigade | Brigadier General G. D. Bayard | |