Provost Guard
 | 
  | 
| 12th New York Infantry, Cos. D&F | 
Major Henry W. Ryder | 
  | 
First Division
 | 
Brigadier General J. J. Bartlett (to 8/9) Brigadier General Charles Griffin
  | 
| First Brigade | 
Colonel W. S. Tilton (to 8/27) Lieutenant Colonel W. A. Throop
  | 
  | 
| 121st Pensylvania Infantry Regiment  | 
  | 
  | 
| 142nd Pensylvania Infantry Regiment  | 
  | 
  | 
| 143rd Pensylvania Infantry Regiment  | 
  | 
  | 
| 149th Pensylvania Infantry Regiment  | 
  | 
  | 
| 150th Pensylvania Infantry Regiment  | 
Colonel H. S. Huidekoper | 
  | 
| 187th Pensylvania Infantry Battalion | 
Lieutenant Colonel Joseph F. Ramsey | 
  | 
| Second Brigade  | 
Colonel E. M. Gregory
  | 
| 22nd Massachusetts Infantry Regiment  | 
Colonel William S. Tilton | 
  | 
| 32nd Massachusetts Infantry Regiment | 
Lieutenant Colonel Luther Stephenson | 
  | 
| 91st Pensylvania Infantry Regiment | 
  | 
  | 
| 155th Pensylvania Infantry Regiment | 
Colonel Alfred L. Pearson | 
  | 
| 21st Pennsylvania Cavalry (Dismounted) | 
  | 
  | 
| Third Brigade  | 
Colonel Norval E. Welch (to 8/9) Brigadier General J. J. Bartlett (to 8/17) Colonel James Gwyn
  | 
| 20th Maine Infantry Regiment | 
  | 
  | 
| 18th Massachusetts Infantry Regiment | 
  | 
  | 
| 1st Michigan Infantry Regiment | 
Lieutenant Colonel William A. Throop | 
  | 
| 16th Michigan Infantry Regiment | 
Colonel Norval E. Welch | 
  | 
| 44th New York Infantry Regiment | 
Lieutenant Colonel Freeman Conner | 
  | 
| 83rd Pennsylvania Infantry Regiment | 
Major William H. Lamont | 
  | 
| 118th Pennsylvania Infantry Regiment | 
Colonel James Gwynn (^ 8/17) | 
  | 
Second Division 
 | 
Brigadier General Romeyn B. Ayres | 
| First Brigade | 
Brigadier General Joseph Hayes (c 8/19) Colonel F. Winthrop (to 8/21) Colonel C. P. Stone | 
| 5th New York Veteran Infantry | 
  | 
  | 
| 15th New York Heavy Artillery | 
  | 
from 3 Brig. (below) | 
| 2nd United States Infantry Regiment  | 
  | 
  | 
| 10th United States Infantry Regiment  | 
  | 
  | 
| 11th United States Infantry Regiment  | 
  | 
  | 
| 12th United States Infantry Regiment  | 
  | 
  | 
| 17th United States Infantry Regiment  | 
  | 
  | 
| Second Brigade | 
Colonel Nathan T. DuShane (k 8/21) Colonel Samuel A. Graham
  | 
  | 
| 1st Maryland Infantry Regiment | 
Lieutenant Colonel John W. Wilson | 
  | 
| 4th Maryland Infantry Regiment | 
Colonel Richard N. Bowerman | 
  | 
| 7th Maryland Infantry Regiment | 
  | 
  | 
| 8th Maryland Infantry Regiment | 
Colonel Andrew W. Denison | 
  | 
| Purnell Legion Maryland Infantry | 
Colonel Samuel A. Graham (^ 8/21) | 
  | 
| Third Brigade (until 8/21) | 
Colonel J. Howard Kitching | 
| 6th New York Heavy Artillery | 
  | 
to 1 Brig. Hardin’s Div. 22 Corps, Dept. Washington | 
| 15th New York Heavy Artillery | 
  | 
to 1 Brig. (above) | 
| Third Brigade (reorganized) | 
Colonel J. W. Hoffman | 
reorganized 8/24 | 
| 3rd Delaware Infantry | 
  | 
from 4 Div. 2 Brig. (below) | 
| 4th Delaware Infantry | 
  | 
| 76th New York Infantry Regiment  | 
Major John W. Young | 
| 95th New York Infantry Regiment  | 
Major Edward Pye | 
| 147th New York Infantry Regiment  | 
Major George Harney | 
| 56th Pennsylvania Infantry Regiment  | 
  | 
| 157th Pennsylvania Infantry Regiment  | 
  | 
Third Division
 | 
Brigadier General Samuel W. Crawford
  | 
| First Brigade | 
Colonel Peter Lyle (to 8/27) Colonel T. F. McCoy | 
| 16th Maine Infantry Regiment | 
  | 
  | 
| 39th Massachusetts Infantry Regiment | 
Colonel P. Stearns Davis | 
  | 
| 104th New York Infantry Regiment | 
Colonel Gilbert G. Prey | 
  | 
| 90th Pennsylvania Infantry Regiment | 
  | 
  | 
| 107th Pennsylvania Infantry Regiment | 
  | 
  | 
| 190th Pensylvania Infantry Regiment  | 
  | 
from 3 Brig. (below) | 
| 191st Pensylvania Infantry Regiment  | 
  | 
from 3 Brig. (below) | 
| Second Brigade | 
Brigadier General Henry Baxter (to 8/15) Colonel Richard Coulter (to 8/18) Colonel Charles Wheelock (to 8/29) Brigadier General Henry Baxter
  | 
| 94th New York Infantry Regiment | 
Lieutenant Colonel Samuel Moffett | 
  | 
| 97th New York Infantry Regiment | 
Colonel Charles Wheelock | 
  | 
| 11th Pennsylvania Infantry Regiment | 
  | 
  | 
| 88th Pennsylvania Infantry Regiment | 
  | 
  | 
| Third Brigade (to 8/21) | 
Colonel William Hartshorne (to 8/21) | 
consolidated with 1 Brig. 8/21 | 
| 190th Pensylvania Infantry Regiment  | 
  | 
to 1 Brig. (above) | 
| 191st Pensylvania Infantry Regiment  | 
  | 
to 1 Brig. (above) | 
| Third Brigade (after 8/21) “Iron Brigade” | 
Colonel Edward S. Bragg  | 
| 7th Indiana Infantry Regiment  | 
Colonel Ira G. Grover | 
from 4 Div. 1 Brig. (below) 8/24 | 
| 19th Indiana Infantry Regiment  | 
  | 
| 24th Michigan Infantry Regiment  | 
Colonel Henry A. Morrow | 
| 1st New York Sharpshooter Battalion | 
Captain Volney J. Shipman | 
| Independent Battalion Wisconsin Volunteers | 
Captain Dennis B. Daily (w 8/21)  Lieutenant Albert T. Morgan | 
| 6th Wisconsin Infantry Regiment  | 
Lieutenant Colonel John Mansfield | 
| 7th Wisconsin Infantry Regiment  | 
Major Mark Finnicum | 
Fourth Division
 | 
Brigadier General Lysander Cutler (mw 8/24) *dissolved – see note
  | 
| First Brigade (“Iron Brigade”)  | 
Colonel Edward S. Bragg  | 
| 7th Indiana Infantry Regiment  | 
Colonel Ira G. Grover | 
redesignated 3 Div. 3 Brig. 8/24 | 
| 19th Indiana Infantry Regiment  | 
  | 
| 24th Michigan Infantry Regiment  | 
Colonel Henry A. Morrow | 
| 1st New York Sharpshooter Battalion | 
Captain Volney J. Shipman | 
| Independent Battalion Wisconsin Volunteers | 
Captain Dennis B. Daily | 
| 6th Wisconsin Infantry Regiment  | 
Lieutenant Colonel John Mansfield | 
| 7th Wisconsin Infantry Regiment  | 
Major Mark Finnicum | 
| Second Brigade | 
Colonel J. W. Hoffman | 
  | 
| 3rd Delaware Infantry | 
  | 
redesignated 2 Div.  3 Brig. 8/24 | 
| 4th Delaware Infantry | 
  | 
| 76th New York Infantry Regiment  | 
Major John W. Young | 
| 95th New York Infantry Regiment  | 
Major Edward Pye | 
| 147th New York Infantry Regiment  | 
Major George Harney | 
| 56th Pennsylvania Infantry Regiment  | 
  | 
| 157th Pennsylvania Infantry Regiment  | 
  | 
| Artillery | 
Captain Augustus P. Martin | 
| 3rd Massachusetts Battery | 
Lieutenant Aaron F. Walcott | 
  | 
| 5th Massachusetts Battery | 
Captain Charles A Phillips | 
  | 
| 9th Massachusetts Battery | 
  | 
  | 
| 1st New York Artillery, Battery B | 
  | 
  | 
| 1st New York Artillery, Battery C | 
  | 
  | 
| 1st New York Artillery, Battery D | 
  | 
  | 
| 1st New York Artillery, Battery E | 
  | 
  | 
| 1st New York Artillery, Battery H | 
  | 
  | 
| 1st New York Artillery, Battery L | 
  | 
  | 
| 15th New York Independent Battery | 
  | 
  | 
| 1st Pennsylvania Artillery, Battery B | 
  | 
  | 
| 4th United Artillery, Battery B | 
  | 
  | 
| 5th United Artillery, Battery D | 
  | 
  |