< to September • October 1862 • to November >
Commanded by:
Major General Nathaniel P. Banks (to 10/17)
Major General Samuel P. Heintzelman
| Defenses North of the Potomac | Lieutenant Colonel Joseph A. Haskin | |
| First Brigade | Colonel Augustus A. Gibson | |
| 3rd Maine Battery | ||
| 2nd Pennsylvania Heavy Artillery | Colonel Augustus A. Gibson | |
| 11th Vermont Infantry Regiment | Colonel James M. Warner | serving as heavy artillery |
| Second Brigade | Colonel Lewis O. Morris | |
| 16th Indiana Battery | from Army Potomac, 12 Corps, 2 Div. Art. | |
| 18th Maine Infantry Regiment | Colonel Daniel Chaplin | serving as heavy artillery |
| 113th New York Infantry Regiment | Colonel Lewis O. Morris | serving as heavy artillery |
| 138th New York Infantry Regiment | Colonel Joseph Welling | serving as heavy artillery |
| 117th New York Infantry, 2nd Battalion | Colonel William R. Pease | |
| Third Brigade | Colonel William R. Pease | |
| 5th Battalion New York Heavy Artillery | ||
| 6th Battalion New York Heavy Artillery | ||
| 7th Battalion New York Heavy Artillery | ||
| 117th New York Infantry, 1st Battalion | Colonel William R. Pease | |
| District of Alexandria | Brigadier General John P. Slough | |
| 1st District of Columbia Infantry Regt. | from 12th Corps, 2nd Div., 3rd Brig. | |
| 153rd New York Infantry Regiment | from Abercrombie’s Prov. Brig. (below) | |
| 11th Rhode Island Infantry Regiment | ||
| District of Alexandria Artillery | Brigadier General John Tyler | |
| 1st Connecticut Heavy Artillery | from unassigned artillery (below) | |
| 19th Connecticut Infantry Regiment | from unassigned artillery (below) | |
| 1st Massachusetts Heavy Artillery | from Whipple’s Command (below) | |
| 34th Massachusetts Infantry Regiment | Colonel George D. Wells | from unassigned infantry (below) |
| 2nd New York Heavy Artillery Regiment | Colonel Gustave Wagner | from Whipple’s Command (below) |
| 1st Wisconsin Heavy Artillery | from Whipple’s Command (below) | |
| Abercrombies’ Division | Brigadier General John J. Abercrombie | created October |
| Provisional (First) Brigade | Colonel Clarence Buell | |
| 152nd New York Infantry Regiment | Colonel Leonard Boyer | from New York |
| 153rd New York Infantry Regiment | Colonel Duncan McMartin | from New York |
| 169th New York Infantry Regiment | Lieutenant Colonel John McConihe | from New York |
| Second Brigade | Brigadier General R. Cowden | |
| 22nd Connecticut Infantry Regiment | Colonel George S. Burnham | from Connecticut |
| 40th Massachusetts Infantry Regiment | Colonel Burr B. Porter | from Massachusetts |
| 141st New York Infantry Regiment | Colonel Samuel G. Hatheway | from New York |
| 16th West Virginia Infantry Regiment | from West Virginia | |
| Third Brigade | Colonel William Gurney | |
| 127th New York Infantry Regiment | Lieutenant Colonel Stewart Woodford | from New York |
| 142nd New York Infantry Regiment | Colonel Roscius W. Judson | from New York |
| 143rd New York Infantry Regiment | Colonel David P. De Witt | from New York |
| 144th New York Infantry Regiment | Colonel Robert S. Hughston | from New York |
| Artillery | ||
| 9th Massachusetts Battery | Captain John Bigelow | from Massachusetts |
| 17th New York Independent Battery | Captain George T. Anthony | from Camp Berry |
| 4th New York Heavy Artillery Regiment | Colonel Gustavus A. DeRussy | from Whipple’s Div. (below) |
| Casey’s Division | Major General Silas Casey | Expanded from Casey’s Prov. Brig. |
| First Brigade | Colonel Dexter Wright | |
| 15th Connecticut Infantry Regiment | Colonel Dexter R. Wright | from Casey’s Prov. Brig. |
| 13th New Hampshire Infantry Regiment | Colonel Aaron F. Stevens | from New Hampshire |
| 12th Rhode Island Infantry Regiment | Colonel George H. Browne | from Rhode Island |
| 25th New Jersey Infantry Regiment | Colonel Andrew Derrom | from New Jersey |
| 27th New Jersey Infantry Regiment | Colonel George W. Mindil | from New Jersey |
| Second Brigade | Colonel Asa P. Blunt | |
| 12th Vermont Infantry Regiment | Colonel Asa P. Blunt | from Vermont |
| 13th Vermont Infantry Regiment | Colonel Francis V. Randall | from Vermont |
| 14th Vermont Infantry Regiment | Colonel William T. Nicholls | from Vermont |
| 15th Vermont Infantry Regiment | from Vermont | |
| 16th Vermont Infantry Regiment | Colonel Wheelock G. Veazey | from Vermont |
| 2nd Connecticut Independent Battery | Captain John William Sterling | from Connecticut |
| Third Brigade | Colonel Frank Fessenden | |
| 22nd Maine Infantry Regiment | Colonel Simon G. Jerrard | |
| 25th Maine Infantry Regiment | Colonel Francis Fessenden | |
| 26th Maine Infantry Regiment | Colonel Nathan H. Hubbard | |
| 27th Maine Infantry Regiment | Colonel Rufus Tapley | |
| Keystone (PA) Battery | ||
| 11th Massachusetts Independent Battery | ||
| 11th New Hampshire Infantry Regiment | Colonel Colonel Walter Harriman | to Army Potomac 9 Corps 2 Div. 2 Brig, |
| 11th New Hampshire Infantry Regiment | Colonel Colonel Walter Harriman | to Army Potomac 9 Corps 2 Div. 2 Brig, |
| Provisional Brigade | Major General Silas Casey | |
| 22nd New Jersey Infantry Regiment | Colonel Abraham G. Demarest | from unassigned infantry (below) |
| 24th New Jersey Infantry Regiment | Colonel Colonel William B. Robertson | from unassigned infantry (below) |
| 28th New Jersey Infantry Regiment | Colonel Moses Nelson Wisewell | from unassigned infantry (below) |
| 29th New Jersey Infantry Regiment | Colonel Edwin F. Applegate | from unassigned infantry (below) |
| 30th New Jersey Infantry Regiment | Colonel Alexander F. Donaldson | from unassigned infantry (below) |
| 31st New Jersey Infantry Regiment | Colonel Alexander P. Berthoud | from unassigned infantry (below) |
| Grover’s Brigade | Brigadier General Cuvier Grover | |
| 22nd Maine Infantry Regiment | ||
| 23rd Maine Infantry Regiment | ||
| 39th Massachusetts Infantry Regiment | ||
| 14th New Hampshire Infantry Regiment | Colonel Rober Wilson | |
| 10th Vermont Infantry Regiment | ||
| 10th Massachusetts Battery | ||
| Whipple’s Division | Brigadier General Amiel W. Whipple | |
| Piatt’s Brigade | Brigadier General Abram S. Piatt | |
| 86th New York Infantry Regiment | Colonel Benajah P. Bailey | |
| 124th New York Infantry Regiment | Colonel A. Van Horne Ellis | |
| 122nd Pennsylvania Infantry Regiment | Colonel Emlen Franklin | |
| 63rd Indiana Infantry (4 companies) | to Indianapolis | |
| Second Brigade | Colonel S. S. Carroll | |
| 163rd New York Infantry Regiment | Colonel F. H. Braulich | |
| 84th Pennsylvania Infantry Regiment | Colonel Samuel M. Bowman | |
| 110th Pennsylvania Infantry Regiment | ||
| 1st West Virginia Infantry Regiment | to Wheeling WV | |
| Unassigned units | ||
| 1st Massachusetts Heavy Artillery | to District Alexandria (above) | |
| 12th New Hampshire Infantry Regiment | Colonel Joseph H. Potter | |
| 2nd New York Heavy Artillery Regiment | Colonel Gustave Wagner | to District Alexandria (above) |
| 4th New York Heavy Artillery Regiment | Colonel Gustavus A. DeRussy | to Abercrombie’s Div. (above) |
| 11th New York Independent Battery | ||
| 120th New York Infantry Regiment | Colonel George H. Sharpe | to Army Potomac 2 Div. 3 Corps, 1 Brig. |
| 1st Ohio Artillery, Battery H | Captain James F. Huntington | to Army Potomac 3 Corps 3 Div. Artillery |
| 127th Pennsylvania Infantry Regiment | Colonel William W. Jennings | |
| Wrigley’s (PA) Engineer Company | Captain H.E. Wrigley | to Defences Upper Potomac (above) |
| 1st Wisconsin Heavy Artillery | to District Alexandria (above) | |
| Cavalry Brigade | Colonel R. Butler Price | from Cavalry, 2 Corps, Army VA |
| 1st Michigan Cavalry Regiment | ||
| 5th New York Cavalry Regiment | ||
| 1st Ohio Cavalry, Cos. A & C | ||
| 2nd Pennsylvania Cavalry Regiment | Colonel Richard B. Price | |
| 1st Vermont Cavary Regiment | ||
| 1st West Virginia Cavalry (8 Cos.) | ||
| Railroad Guard | ||
| 11th New York Cavalry Regiment | Colonel James B. Swain | |
| Camp Barry, Light Artillery Camp | General William F. Barry | Artillery Camp of Instruction created Oct. |
| 1st Delaware Battery | from Delaware | |
| 12th New York Independent Battery | from Whipple’s Division (above) | |
| 16th New York Independent Battery | from unassigned artillery (below) | |
| 17th New York Independent Battery | from New York; to Abercrombie’s Div. (above) | |
| 19th New York Independent Battery | from New York | |
| West Virginia Artillery, Battery A | from unassigned artillery (below) | |
| Unassigned Infantry | ||
| 2nd District of Columbia Infantry Regt. | ||
| 19th Maine Infantry Regiment | Colonel Frederick D. Sewell | to Army Potomac, 2 Corps, 2 Div, 1 Brig. |
| 34th Massachusetts Infantry Regiment | Colonel George D. Wells | to Distict Alexandria Artillery (above) |
| 10th New Jersey Infantry Regiment | Colonel William R. Murphy | |
| 22nd New Jersey Infantry Regiment | Colonel Abraham G. Demarest | to Casey’s Provisional Brigade |
| 24th New Jersey Infantry Regiment | Colonel Colonel William B. Robertson | to Casey’s Provisional Brigade |
| 29th New Jersey Infantry Regiment | Colonel Edwin F. Applegate | to Casey’s Provisional Brigade |
| 30th New Jersey Infantry Regiment | Colonel Alexander F. Donaldson | to Casey’s Provisional Brigade |
| 31st New Jersey Infantry Regiment | Colonel Alexander P. Berthoud | to Casey’s Provisional Brigade |
| 147th New York Infantry Regiment | Colonel Andrew S. Warner | from New York |
| 135th Pennsylvania Infantry Regiment | Colonel James R. Porter | |
| 149th Pennsylvania Infantry Regiment | Colonel Roy Stone | |
| 150th Pennsylvania Infantry Regiment | Colonel Langhorne Wister | |
| Unassigned Artillery | ||
| 1st Connecticut Heavy Artillery | to Distict Alexandria Artillery (above) | |
| 19th Connecticut Infantry Regiment | to Distict Alexandria Artillery (above) | |
| 16th New York Independent Battery | to Camp Barry (above) | |
| West Virginia Artillery, Battery A | to Camp Barry (above) | |