Army of the Potomac September 1861

United States Army

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Commanded by Major General George B. McClellan

Banks’ Division

 Major General Nathaniel P. Banks
First Brigade Colonel George H. Gordon
5th Connecticut Infantry Regiment Colonel Orris S. Ferry
1st Maryland Infantry Regiment Colonel John R. Kenly
2nd Massachusetts Infantry Regiment Lieutenant Colonel George Andrews
19th New York Infantry Regiment Colonel James Ledlie
28th New York Infantry Regiment Colonel Dudley Donnelly
13th Pennsylvania Reserves Infantry Colonel Charles Biddle
28th Pennsylvania Infantry Regiment Colonel John Geary
Second Brigade Brigadier General John J. Abercrombie
4th Connecticut Infantry Regiment Colonel Levi Woodhouse  to Defenses Washington 9/5
12th Indiana Infantry Regiment
16th Indiana Infantry Regiment
12th Massachusetts Infantry Regiment Colonel Fletcher Webster
66th Pennsylvania Infantry Regiment Colonel Alfred W. Chantry from Philadelphia 9/20
Third Brigade Colonel Charles P. Stone
27th Indiana Infantry Regiment Colonel Silas Colgrove  from Indianapolis 9/15
13th Massachusetts Infantry Regiment Colonel Samuel H. Leonard
9th New York State Militia Regiment Colonel John W. Stiles
29th Pennsylvania Infantry Regiment Colonel John K. Murphy
3rd Wisconsin Infantry Regiment Colonel Samuel H. Leonard

Casey’s Provisional Division

 Brigadier General Silas Casey (see Note below)
5th New Jersey Infantry Regiment Colonel Samuel H. Starr  from Trenton 8/29
6th New Jersey Infantry Regiment Colonel James T. Hatfield  from Trenton 9/10
7th New Jersey Infantry Regiment Colonel Joseph W. Revere  from Trenton 9/19
8th New Jersey Infantry Regiment Colonel Adolphus J. Johnson  from Trenton 9/14
4th New Hampshire Infantry Regt. Colonel Thomas J. Whipple  from Manchester NH 9/30
68th New York Infantry Regiment Colonel Robert J. Betge  from New York City 8/24
73rd Pennsylvania Infantry Regiment Colonel John A. Koltes  from Philadelphia 9/24
75th Pennsylvania Infantry Regiment Colonel Henry Bohlen  from Philadelphia 9/26
100th Pennsylvania Infantry Regiment Colonel Daniel Leasure  from Pittsburg 9/2

Dix’s Division, Baltimore

 Major General John Dix
Infantry
20th Indiana Infantry Regiment Colonel William L. Brown  to Sherman’s Expedition 9/24
21st Indiana Infantry Regiment Colonel James W. McMillan
1st Maryland Eastern Shore Regiment Colonel James Wallace  Organized at Cambridge, Md.
2nd Maryland Infantry Regiment Colonel John Sommer  Organized at Baltimore
3rd Maryland Infantry Regiment Colonel John C. McConnell  Organized at Baltimore
5th Maryland Infantry Regiment Colonel William L. Schley  Organized at Baltimore
Patapsco Maryland Guard Colonel James W. McMillan  Organized at Ellicott’s Mills, Md. 9/25
17th Massachusetts Infantry Regiment Colonel Thomas I.C. Amory
7th Maine Infantry Regiment Colonel Thomas H. Marshall
6th Michigan Infantry Regiment Colonel Frederick W. Curtenius from Kalamazoo Mi. 9/2
3rd New York Infantry Regiment Colonel Samuel M. Alford
4th New York Infantry Regiment Colonel Alfred W. Taylor
5th New York Infantry Regiment Colonel Abram Duryea (to BG. 9/10)
Colonel Gouverneur K. Warren
87th Pennsylvania Infantry Regiment Colonel George Hay organized at Yorktown
Division Artillery & Cavalry
2nd United States Artillery, Battery I at Fort McHenry
1st Maryland Cavalry Regiment Colonel Andrew G. Miller

McCall’s Division

“Pennsylvania Reserves”

 Brigadier General George McCall
First Brigade Brigadier General John Reynolds
1st Pennsylvania Reserves Colonel Richard B. Roberts
2nd Pennsylvania Reserves Colonel William B. Mann  from Sandy Hook 9/25
5th Pennsylvania Reserves Colonel Seneca G. Simmons
8th Pennsylvania Reserves Colonel George S. Hays
Second Brigade Brigadier General George Meade
3rd Pennsylvania Reserves Colonel Horatio G. Sickel
4th Pennsylvania Reserves Col. Robert G. March
7th Pennsylvania Reserves Colonel Elisha B. Harvey
11th Pennsylvania Reserves Colonel Thomas F. Gallagher
Third Brigade Brigadier General Edward O. C. Ord (from 9/14)
6th Pennsylvania Reserves Colonel William W. Ricketts
9th Pennsylvania Reserves Colonel Conrad F. Jackson
10th Pennsylvania Reserves Colonel John S. McCalmont
12th Pennsylvania Reserves Colonel John H. Taggart
Artillery and Cavalry
Battery A, 1st Pennsylvania Artillery
Battery B, 1st Pennsylvania Artillery
Battery G, 1st Pennsylvania Artillery
Battery C, 5th United States Artillery newly organized in Washington
1st Pennsylvania Cavalry Col. George Bayard (from 9/14)

McDowell’s Division

 Brigadier General Irwin McDowell
First Brigade Brigadier General Edward D. Keyes
22nd New York Infantry Regiment Colonel Walter Phelps from Keyes’ Brigade, Div. Potomac
24th New York Infantry Regiment Colonel Timothy Sullivan
30th New York Infantry Regiment Colonel Edward Frisby
14th New York State Militia Colonel Alfred M. Wood
Second Brigade Brigadier General J. S. Wadsworth
21st New York Infantry Regiment Colonel William F. Rogers from Fort Runyon, Div. Potomac
23rd New York Infantry Regiment Colonel Henry C. Hoffman from Hunter’s Bde., Div. Potomac
35th New York Infantry Regiment Colonel Newton B. Lord from Hunter’s Bde., Div. Potomac
Third Brigade Brigadier General Rufus King
2nd Wisconsin Infantry Regiment Colonel Edgar O’Connor from Fort Corcoran, Div. Potomac
6th Wisconsin Infantry Regiment Colonel Lysander Cutler from Defenses of Washington
19th Indiana Infantry Regiment Colonel Solomon Meredith from Defenses of Washington
Division Artillery and Cavalry
Battery G, 1st United States Artillery from Richardson’s Bde., Div. Potomac
Battery M, 2nd United States Artillery from Franklin’s Bde., Div. Potomac
2nd New York Cavalry Regiment Colonel J. Mansfield Davies

Porter’s Division

 Brigadier General Fitz John Porter
First Brigade Brigadier General George W. Morrell
9th Massachusetts Infantry Regiment Colonel Thomas Cass from Sherman’s Brig., Div. Potomac
4th Michigan Infantry Regiment Colonel Dwight A. Woodbury
14th New York Infantry Regiment Colonel James McQuade
Second Brigade Brigadier General J. H. Martindale
2nd Maine Infantry Regiment Colonel Charles D. Jameson (to 9/3)
Colonel Charles W. Roberts		 from Fort Corcoran (below)
18th Massachusetts Infantry Regiment Colonel James Barnes from Fort Corcoran (below)
13th New York Infantry Regiment Colonel John Pickell from Fort Corcoran (below)
41st New York Infantry Regiment Colonel Leopold Von Gilsa from Sherman’s Brig., Div. Potomac
Third Brigade Brigadier General Daniel Butterfield
16th Michigan Infantry Regiment Colonel Thomas Stockton from Detroit 9/16
17th New York Infantry Regiment Colonel H. Seymour Lansing from Fort Ellsworth
25th New York Infantry Regiment Colonel James E. Kerrigan from Hunter’s Brig., Div. Potomac
Division Artillery
Battery E, 2nd United States Artillery from Div. Potomac
Battery E, 3rd United States Artillery from Sherman’s Brig., Div. Potomac
Division Cavalry
3rd Pennsylvania Cavalry Regiment Colonel William Young  from Philadelphia in August

Note: Casey’s Provisional Division acted as a receiving depot for new regiments, which were trained and organized into brigades or attached to existing units.

Unattached Units on 9/1

Blenker’s Brigade Brigadier General Louis Blenker
8th New York Infantry Regiment Lieutenant Colonel Julius Stahel to Blenker’s Brig., Hooker’s Div.
29th New York Infantry Regiment Colonel Adolph Von Steinwehr
39th New York Infantry Regiment Colonel Frederick G. D’Utassy
27th Pennsylvania Infantry Regiment Colonel M. Einstein
2nd New York Independent Battery Captain C. Bookwood
4th New York Cavalry Regiment Colonel Christian F. Dickel
Couch’s Brigade Brigadier General Darius N. Couch
7th Massachusetts Infantry Regiment Colonel Darius Couch (to 9/3)
Colonel Nelson H. Davis		 to Couch’s Brig., Buell’s Div.
10th Massachusetts Infantry Regiment Colonel Henry S. Briggs
36th New York Infantry Regiment Colonel C. H. Innes
2nd Rhode Island Infantry Regiment Colonel Frank Wheaton
Franklin’s Brigade Brigadier General William B. Franklin
15th New York Infantry Regiment Colonel J. McLeod Murphy to Newton’s Brig., Franklin’s Div.
18th New York Infantry Regiment Colonel William A. Jackson
31st New York Infantry Regiment Colonel Calvin E. Pratt
32nd New York Infantry Regiment Colonel R. Matheson
2nd United States Artillery, Battery M Captain Henry J. Hunt
1st New York Cavalry Regiment Colonel A. McReynolds
Graham’s Brigade Brigadier General L. P. Graham created late August
23rd Pennsylvania Infantry Regiment Colonel David Birney from Philadelphia early Sept.
to Graham’s Brig, Buell’s Div.
65th New York Infantry Regiment Colonel John Cochrane to Graham’s Brig, Buell’s Div.
67th New York Infantry Regiment Colonel Julius Adams to Graham’s Brig, Buell’s Div.
Heintzelman’s Brigade Brigadier General Samuel P. Heintzelman
5th Maine Infantry Regiment Colonel Mark H. Dunnell (res. 9/2)
Colonel Nathaniel J. Jackson		 to Slocum’s Brig., Franklin’s Div.
16th New York Infantry Regiment Colonel Thomas A. Davies
26th New York Infantry Regiment Colonel William H. Christian
27th New York Infantry Regiment Major Joseph J. Bartlett
2nd United States Artillery, Battery A Captain Tidball to Blenker’s Brigade, Hooker’s Division
Hooker’s Brigade Brigadier General Joseph Hooker
2nd New Hampshire Infantry Regiment Colonel Gilman Marston to 1st Brig., Hooker’s Div.
1st Massachusetts Infantry Regiment Colonel Robert Cowdin to 1st Brig., Hooker’s Div.
11th Massachusetts Infantry Regiment Colonel George Clark to 1st Brig., Hooker’s Div.
1st Michigan Infantry Regiment Colonel John C. Robertson from Michigan 9/16; to 1st Brig., Hooker’s Div.
26th Pennsylvania Infantry Regiment Colonel William F. Small to 1st Brig., Hooker’s Div.
Howard’s Brigade Brigadier General Oliver O. Howard created 9/7
3rd Maine Infantry Regiment Colonel Oliver O. Howard (to 9/7)
Colonel Henry G. Staples		 to Sedgwick’s Brig., Heintzelman’s Div.
4th Maine Infantry Regiment Colonel Hiram G. Berry
38th New York Infantry Regiment Colonel J. H. H. Ward
40th New York Infantry Regiment Colonel Edward J. Riley
Hunter’s Brigade Brigadier General David Hunter
23rd New York Infantry Regiment Colonel Henry C. Hoffman to Wadsworth’s Brig., McDowell’s Div.
25th New York Infantry Regiment Colonel James E. Kerrigan to Butterfield’s Brig., Porter’s Div. (above)
35th New York Infantry Regiment Colonel Newton B. Lord to Wadsworth’s Brig., McDowell’s Div.
37th New York Infantry Regiment Lt. Colonel Samuel B. Hayman to Richardson’s Brig., Heintzelman’s Div.
Kearney’s Brigade Brigadier General Phillip Kearney
1st New Jersey Infantry Regiment Colonel Alfred T.A. Torbert to Kearney’s Brig. Franklin’s Div.
2nd New Jersey Infantry Regiment Colonel George W. McLean
3rd New Jersey Infantry Regiment Colonel George W. Taylor
4th New Jersey Infantry Regiment Colonel James H. Simpson
1st New Jersey Artillery, Battery A Captain William Hexamer to Artillery, Franklin’s Div.
2nd United States Artillery, Battery D to Artillery, Franklin’s Div.
2nd United States Artillery, Battery G Captain Greene to Artillery, Heintzelman’s Div.
2nd United States Cavalry, Company G to Provost Guard, Army Potomac
Keyes’ Brigade Brigadier General Erasmus Keyes
14th New York State Militia Lt. Colonel E.B. Fowler to Keyes’ Brig., McDowell’s Div.
22nd New York Infantry Regiment Colonel Walter Phelps
24th New York Infantry Regiment Colonel Timothy Sullivan
30th New York Infantry Regiment Colonel Edmund Frisby
Lander’s Brigade Brigadier General F. W. Lander
19th Massachusetts Infantry Regiment Colonel Edward W. Hincks from Mass.; to Lander’s Brig., Stone’s Div.
20th Massachusetts Infantry Regiment Colonel William R. Lee
7th Michigan Infantry Regiment Colonel Erastus B. Tyler from Mich. 9/5; to Lander’s Brig., Stone’s Div.
Richardson’s Brigade Brigadier General Israel Richardson
12th New York Infantry Regiment Colonel Ezra L. Walrath (res. 9/25)
Lieutenant Colonel Henry A. Weeks		 to Wadsworth’s Brig., McDowell’s Div.
2nd Michigan Infantry Regiment Colonel Orlando M. Poe (from 9/16)
3rd Michigan Infantry Regiment Colonel Daniel McConnel
1st United States Artillery, Battery G Lieutenant J. Edwards to Artillery Reserve, Army Potomac
Sherman’s Brigade Brigadier General William T. Sherman
9th Massachusetts Infantry Regiment Colonel Thomas Cass to Martindale’s Brig., Porter’s Div. (above)
4th Michigan Infantry Regiment Colonel Dwight A. Woodbury to Morell’s Brig., Porter’s Div. (above)
14th New York Infantry Regiment Colonel James McQuade to Morell’s Brig., Porter’s Div. (above)
41st New York Infantry Regiment Colonel Leopold Von Gilsa to Martindale’s Brig., Porter’s Div. (above)
3rd United States Artillery, Battery E Captain Hamilton to Artillery, Porter’s Div. (above)
2nd United States Cavalry, Company I to Provost Guard, Army Potomac (above)
Sickles’ Brigade Brigadier General Daniel E. Sickles
70th New York Infantry Regiment Colonel William Dwight to Sickles’ Bde., Hooker’s Div.
71st New York Infantry Regiment Colonel George B. Hall
72nd New York Infantry Regiment Colonel Nelson Taylor
74th New York Infantry Regiment Colonel Charles K. Graham
Smith’s Brigade Brigadier General William F. Smith
2nd Vermont Infantry Regiment Colonel Henry Whiting to Steven’s Brig., Smith’s Div.
3rd Vermont Infantry Regiment Colonel Breed N. Hyde
6th Maine Infantry Regiment Colonel Abner Knowles
33rd New York Infantry Regiment Colonel Robert F. Taylor
79th New York Infantry Regiment Colonel Isaac Stevens (to 9/28)
Lieutenant Colonel S.M. Elliott
New York Artillery, Battery B Captain Thaddeus P. Mott  to Smith’s Div.
2nd United States Cavalry, Company H to Hancock’s Brig., Smith’s Div.
5th United States Artillery, Battery F organized at Washington; to Smith’s Div.
Stone’s Brigade Brigadier General Charles P. Stone
34th New York Infantry Regiment Colonel W. La Due to Gorman’s Brig., Stone’s Div.
42st New York Infantry Regiment Colonel Milton Cogswell
2nd New York State Militia Colonel G.W.B. Tompkins
15th Massachusetts Infantry Regiment Colonel Charles P. Devens
1st Minnesota Infantry Regiment Colonel W. A. Gorman
1st United States Artillery, Battery I to Stone’s Div.
1st Rhode Island Artillery, Battery B
Fort Corcoran
2nd Maine Infantry Regiment Colonel Charles D. Jameson to Martindale’s Brig., Porter’s Div.
13th New York Infantry Regiment Colonel John Pickell to Martindale’s Brig., Porter’s Div.
2nd Wisconsin Infantry Regiment Colonel P. S. Coon to King’s Brig., McDowell’s Div.
Fort Runyan
21st New York Infantry Regiment Colonel William F. Rogers to Wadsworth’s Brig., McDowell’s Div.
Fort Ellsworth
17th New York Infantry Regiment Colonel H. Seymour Lansing to Butterfield’s Brig., Porter’s Div.