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Commanded by Major General George B. McClellan
| Headquarters | ||
| Banks’ Division | Major General Nathaniel P. Banks | |
| 1st Brigade | Brigadier General Alpheus Williams | |
| 2nd Brigade | Brigadier General J. Abercrombie | |
| 3rd Brigade | Brigadier General C. S. Hamilton | |
| Blenker’s Division | Brigadier General Louis Blenker | |
| 1st Brigade | Brigadier General Julius H. Stahel | |
| 2nd Brigade | Brigadier General Adolph Von Steinwehr | |
| 3rd Brigade | Brigadier General Henry Bohlen | |
| Casey’s Division | Brigadier General Silas Casey | |
| 1st Brigade | Colonel William W.H. Davis | |
| 2nd Brigade | Brigadier General William Keim | |
| 3rd Brigade | Brigadier General Innis N. Palmer | |
| Dix’s Division | Major General John Dix | |
| Franklin’s’s Division | Brigadier General William B. Franklin | |
| 1st Brigade | Brigadier General Philip Kearney | |
| 2nd Brigade | Brigadier General Henry P. Slocum | |
| 3rd Brigade | Brigadier General John Newton | |
| Heintzelman’s Division | Brigadier General Samuel P. Heintzelman | |
| 1st Brigade | Brigadier General Israel B. Richardson | |
| 2nd Brigade | Brigadier General John Sedgwck | |
| 3rd Brigade | Brigadier General Charles D. Jameson | |
| Hooker’s Division | Brigadier General Joseph Hooker | |
| 1st Brigade | Brigadier General H. M. Naglee | |
| 2nd Brigade | Brigadier General Daniel E. Sickles | |
| 3rd Brigade | Colonel S. H. Starr | |
| Keyes’ Division | Brigadier General Erasmus D. Keyes | |
| 1st Brigade | Brigadier General Darius N. Couch | |
| 2nd Brigade | Brigadier General L. P. Graham | |
| 3rd Brigade | Brigadier General J. J. Peck | |
| Lander’s Division | Brigadier General Frederick W. Lander | |
| 1st Brigade | Colonel Nathan Kimball | |
| 2nd Brigade | Colonel J. C. Sullivan | |
| 3rd Brigade | Brigadier General Erasmus B. Tyler | |
| McCall’s’s Division | Brigadier General George McCall | |
| 1st Brigade | Brigadier General John Reynolds | |
| 2nd Brigade | Brigadier General George Meade | |
| 3rd Brigade | Brigadier General Edward O. C. Ord | |
| McDowell’s Division | Brigadier General Irwin McDowell | |
| 1st Brigade | Brigadier General C. C. Augur | |
| 2nd Brigade | Brigadier General John S. Wadsworth | |
| 3rd Brigade | Brigadier General Rufus King | |
| Porter’s Division | Brigadier General Fitz John Porter | |
| 1st Brigade | Brigadier General George W. Morrell | |
| 2nd Brigade | Brigadier General John H. Martindale | |
| 3rd Brigade | Brigadier General Daniel Butterfield | |
| Smith’s Division | Brigadier General William F. Smith | |
| 1st Brigade | Brigadier General W. T. H. Brooks | |
| 2nd Brigade | Brigadier General J. W. Davidson | |
| 3rd Brigade | Brigadier General W. S. Hancock | |
| Stone’s Division | Brigadier General Charles P. Stone | |
| 1st Brigade | Brigadier General W. Gorman | |
| 2nd Brigade | Brigadier General N. J. T. Dana | |
| 3rd Brigade | Brigadier General William W. Burns | |
| Sumner’s Division | Brigadier General Edwin V. Sumner | |
| 1st Brigade | Brigadier General Oliver O. Howard | |
| 2nd Brigade | Brigadier General Thomas F. Meagher | |
| 3rd Brigade | Brigadier General William H. French | |
| Artillery Reserve | Colonel Henry K. Hunt | |
| Stoneman’s Cavalry Command/ Cavalry Reserve |
Brigadier General George Stoneman Brigadier General Philip St. George Cooke |
|
| Defenses of Washington | ||