Army of the Potomac August 1861

United States Army

August 1861 * to September >

Commanded by Major General George B. McClellan

The Military District of the Potomac was redesignated the Department or Army of the Potomac on August 15, 1861. It was combined with the Department of the Shenandoah on August 17 and with the Department of Pennsylvania of August 24.

Banks’ Division

Major General Nathaniel P. Banks
First Brigade Colonel George H. Thomas (8/17 – 8/28)
Colonel George H. Gordon
5th Connecticut Infantry Regiment Colonel Orris S. Ferry from 1st Brig. Dept. Shenandoah
1st Maryland Infantry Regiment Colonel John R. Kenly from Dix’s Division, Baltimore
2nd Massachusetts Infantry Regiment Colonel George Gordon (until 8/28)
Lieutenant Colonel George Andrews		 from 2nd Brig. (below)
19th New York Infantry Regiment Colonel John Clarke (until Aug.)
Colonel James Ledlie		 from 1st Brig. Dept. Shenandoah
28th New York Infantry Regiment Colonel Dudley Donnelly from 1st Brig. Dept. Shenandoah
13th Pennsylvania Reserves Infantry Colonel Charles Biddle from 1st Brig. Dept. Shenandoah
28th Pennsylvania Infantry Regiment Colonel John Geary from 1st Brig. Dept. Shenandoah
Second Brigade Colonel John J. Abercrombie (to BG 8/30)
4th Connecticut Infantry Regiment Colonel Levi Woodhouse from 2nd Brig. Dept. Shenandoah
12th Indiana Infantry Regiment from 2nd Brig. Dept. Shenandoah
16th Indiana Infantry Regiment from 2nd Brig. Dept. Shenandoah
2nd Massachusetts Infantry Regiment Colonel George H. Gordon from 2nd Brig. Dept. Shenandoah
to 1st Brig. (above)
12th Massachusetts Infantry Regiment  Colonel Fletcher Webster from 2nd Brig. Dept. Shenandoah
Third Brigade Colonel Charles P. Stone
13th Massachusetts Infantry Regiment Colonel Samuel H. Leonard from Massachusetts 8/1
9th New York State Militia Regiment Colonel John W. Stiles from 3rd Brig. Dept. Shenandoah
29th Pennsylvania Infantry Regiment Colonel John K. Murphy from Philadelphia 8/3; from 2nd Brig. Dept. Shenandoah
3rd Wisconsin Infantry Regiment Colonel Samuel H. Leonard from 3rd Brig. Dept. Shenandoah

Dix’s Division, Baltimore

 Major General John Dix
Infantry
1st Delaware Militia  Colonel Henry H. Lockwood mustered out 8/30
20th Indiana Infantry Regiment Colonel William L. Brown
21st Indiana Infantry Regiment Colonel James W. McMillan
17th Massachusetts Infantry Regiment Colonel Thomas I.C. Amory from Lynnfield, Ma. 8/23
7th Maine Infantry Regiment Colonel Thomas H. Marshall From Augusta, Me., 8/23
3rd New York Infantry Regiment Lt. Colonel Samuel M. Alford promoted colonel 8/26
4th New York Infantry Regiment Colonel Alfred W. Taylor
5th New York Infantry Regiment Colonel C. Schwartzwaelder
1st Pennsylvania Reserves Colonel R. Biddle Roberts to 1 Brig., McCall’s Div. 8/30
19th Pennsylvania Infantry Regiment Colonel Peter Lyle to Philadelphia to muster out 8/29
Artillery & Cavalry
2nd United States Artillery, Battery I at Fort McHenry
1st Maryland Cavalry Regiment Colonel Andrew G. Miller Organized at Baltimore

McCall’s Division

“Pennsylvania Reserves”

 Brigadier General George McCall
First Brigade Brigadier General John Reynolds (from 8/26)
1st Pennsylvania Reserves Colonel Richard B. Roberts from Dix’s Command 8/20
2nd Pennsylvania Reserves Colonel William B. Mann from Baltimore 8/28
5th Pennsylvania Reserves Colonel Seneca G. Simmons frim Harrisburg 8/6
8th Pennsylvania Reserves Colonel George S. Hays from Pittsburg 7/30
Second Brigade Brigadier General George Meade (from 8/31)
3rd Pennsylvania Reserves Colonel Horatio G. Sickel from Harrisburg 7/22
4th Pennsylvania Reserves Colonel Robert G. March from Harrisburg 7/17
7th Pennsylvania Reserves Colonel Elisha B. Harvey from Harrisburg 7/27
11th Pennsylvania Reserves Colonel Thomas F. Gallagher from Harrisburg 6/26
Third Brigade Colonel John H. Taggart
6th Pennsylvania Reserves Colonel William W. Ricketts from Harrisburg 7/27
9th Pennsylvania Reserves Colonel Conrad F. Jackson from Pittsburg 7/27
10th Pennsylvania Reserves Colonel John S. McCalmont from Harrisburg 7/24
12th Pennsylvania Reserves Colonel John H. Taggart from Harrisburg 8/13
Artillery and Cavalry
Battery A, 1st Pennsylvania Artillery from Philadelphia
Battery B, 1st Pennsylvania Artillery from Philadelphia
Battery G, 1st Pennsylvania Artillery from Philadelphia 8/5
1st Pennsylvania Cavalry

Unattached Units as of 8/1

Headquarters
4th United States Cavalry, Cos. A&E Captain James B. McIntyre  from NE VA, 3 Div.
Blenker’s Brigade Brigadier General Louis Blenker
8th New York Infantry Regiment Lieutenant Colonel Julius Stahel (after 8/11) from NE VA, 5 Div., 1 Brig.
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 from New York 8/29
Couch’s Brigade Brigadier General Darius N. Couch
7th Massachusetts Infantry Regiment Colonel Nelson H. Davis from Massachusetts 8/1
10th Massachusetts Infantry Regiment  Colonel Henry S. Briggs from Dist. Washington 8/4
36th New York Infantry Regiment Colonel C. H. Innes from Dept. Washington 8/4
2nd Rhode Island Infantry Regiment Colonel Frank Wheaton from NE VA, 2nd Div., 2 Brig.
Franklin’s Brigade Brigadier General William B. Franklin
15th New York Infantry Regiment Colonel J. McLeod Murphy from McCunn’s Brig., Dept. Washington 8/4
18th New York Infantry Regiment Colonel William A. Jackson from NE VA, 5 Div., 2 Brig. 8/4
31st New York Infantry Regiment Colonel Calvin E. Pratt from NE VA, 5 Div., 2 Brig. 8/4
32nd New York Infantry Regiment Colonel R. Matheson from NE VA, 5 Div., 2 Brig. 8/4
2nd United States Artillery, Battery M Captain H. J. Hunt from NE VA, 1 Div., 4 Brig.
1st New York Cavalry Regiment Colonel A. McReynolds from New York
Heintzelman’s Brigade Brigadier General Samuel P. Heintzelman
5th Maine Infantry Regiment Colonel Mark H. Dunnell from 2 Brig., 5 Div., N.E. VA 8/4
16th New York Infantry Regiment Colonel Thomas A. Davies from 3 Brig., 3 Div., N.E. VA 8/4
26th New York Infantry Regiment Colonel William H. Christian from McCunn’s Brig., Dept. Washington 8/4
27th New York Infantry Regiment Major Joseph J. Bartlett from NE VA, 2 Div., 1 Brig.
2nd United States Artillery, Battery A Captain Tidball from NE VA, 5 Div., 1 Brig. 8/4
Hooker’s Brigade Brigadier General Joseph Hooker
2nd New Hampshire Infantry Regiment Colonel Gilman Marston from NE VA, 2 Div., 2 Brig.
1st Massachusetts Infantry Regiment Colonel Robert Cowdin from NE VA, 1 Div., 4 Brig.
11th Massachusetts Infantry Regiment Colonel George Clark from NE VA, 3 Div., 1st Brig.
26th Pennsylvania Infantry Regiment Colonel William F. Small from Dist. Washington 8/4
Howard’s Brigade Brigadier General Oliver O. Howard
3rd Maine Infantry Regiment Colonel Darius Couch from 3 Brig., 3 Div., N.E. VA 8/4
4th Maine Infantry Regiment Colonel Hiram G. Berry from 3 Brig., 3 Div., N.E. VA 8/4
38th New York Infantry Regiment Colonel J. H. H. Ward from 3 Brig., 2 Div., N.E. VA 8/4
40th New York Infantry Regiment Colonel Edward J. Riley from Dept. Washington 8/4
Hunter’s Brigade Brigadier General David Hunter
23rd New York Infantry Regiment Colonel Henry C. Hoffman from Dept. Washington 8/4
25th New York Infantry Regiment Colonel James E. Kerrigan from Dept. Washington 8/4
35th New York Infantry Regiment Colonel William C. Browne (dis. 8/2)
Colonel Newton B. Lord		 from 2 Brig., 2 Div., NE VA 8/4
37th New York Infantry Regiment Colonel John H. McCunn (dis. 8/31)
Lt. Colonel Samuel B. Hayman		 from McCunn’s Brig., Dept. Washington 8/4
Kearney’s Brigade Brigadier General Phillip Kearney
1st New Jersey Infantry Regiment Colonel William R. Montgomery (to 8/29) from 2 Brig., 4 Div, NE VA
2nd New Jersey Infantry Regiment Colonel George W. McLean from 2 Brig., 4 Div, NE VA
3rd New Jersey Infantry Regiment Colonel George W. Taylor from 2 Brig., 4 Div, NE VA
4th New Jersey Infantry Regiment Colonel James H. Simpson from New Jersey 8/20
1st New Jersey Artillery, Battery A Captain William Hexamer from New Jersey 8/20
2nd United States Artillery, Battery D from 3 Brig., 2 Div., NE VA 8/4
2nd United States Artillery, Battery G Captain Greene from 2 Brig., 2 Div., NE VA 8/4
2nd United States Cavalry, Company G from 2 Brig., 2 Div., NE VA 8/4
Keyes’ Brigade Brigadier General Erasmus Keyes
14th New York State Militia Lt. Colonel E.B. Fowler from 1 Brig., 2 Div., NE VA
22nd New York Infantry Regiment Colonel Walter Phelps from Dept. Washington 8/4
24th New York Infantry Regiment Colonel Timothy Sullivan from Dept. Washington 8/4
30th New York Infantry Regiment Colonel Edmund Frisby from Dept. Washington 8/4
Richardson’s Brigade Brigadier General Israel Richardson
12th New York Infantry Regiment Colonel Ezra L. Walrath from NE VA, 1 Div., 4 Brig.
2nd Michigan Infantry Regiment Major A. W. Williams
3rd Michigan Infantry Regiment Colonel Daniel McConnel
1st United States Artillery, Battery G Lieutenant J. Edwards
Sherman’s Brigade Brigadier General William T. Sherman
9th Massachusetts Infantry Regiment Colonel Thomas Cass from Dept. Washington 8/4
14th New York Infantry Regiment Colonel James McQuade from Dept. Washington 8/4
41st New York Infantry Regiment Colonel Leopold Von Gilsa from NE VA, 4 Div., 2 Brig. 
4th Michigan Infantry Regiment Colonel Dwight A. Woodbury from NE VA, 3 Div., 2 Brig.
3rd United States Artillery, Battery E Captain Hamilton from NE VA, 1 Div., 3 Brig. 
2nd United States Cavalry, Company I from NE VA, 2 Div., 1 Brig. 
Sickles’ Brigade Brigadier General Daniel E. Sickles
70th New York Infantry Regiment Colonel William Dwight From Camp Scott, Staten Island, N.Y.
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 (from 8/13)
2nd Vermont Infantry Regiment Colonel Henry Whiting from NE VA, 3 Div., 3 Brig.
3rd Vermont Infantry Regiment Colonel William F. Smith (to 8/13)
Colonel Breed N. Hyde		 from Vermont 7/28
6th Maine Infantry Regiment Colonel Abner Knowles from Dept. Washington 8/4
33rd New York Infantry Regiment Colonel Robert F. Taylor from Dept. Washington 8/4
79th New York Infantry Regiment Lieutenant Colonel S.M. Elliott from NE VA, 1 Div., 3 Brig.
New York Artillery, Battery B Captain Thaddeus P. Mott from NE VA, 1 Div., 2 Brig.
2nd United States Cavalry, Company H from NE VA, 2 Div., 1 Brig. 
5th United States Artillery, Battery D from NE VA, 2 Div., 1 Brig. 
Stone’s Brigade Brigadier General Charles P. Stone
15th Massachusetts Infantry Regiment Colonel Charles P. Devens from Massachusetts 8/11
1st Minnesota Infantry Regiment Colonel W. A. Gorman from NE VA, 1 Div., 3 Brig.
34th New York Infantry Regiment Colonel W. La Due from Dept. Washington 8/4
42st New York Infantry Regiment Colonel W. D. Kennedy from Dept. Washington 8/4
2nd New York State Militia Colonel G. W. B. Tompkins from NE VA, 1 Div., 2 Brig.
1st United States Artillery, Battery I from NE VA, 1 Div., 3 Brig.
1st Rhode Island Artillery, Battery B from Rhode Island 8/23
Reserve Cavalry
2nd United States Cavalry Regiment
Fort Albany
14th Massachusetts Infantry Regiment from Defences Washington
Fort Corcoran
2nd Maine Infantry Regiment Colonel Charles D. Jameson From NE VA, 1 Div. 1 Brig.
13th New York Infantry Regiment Colonel Isaac F. Quinby (to 8/5)
Colonel John Pickell (after 8/5)		 From NE VA, 1 Div., 3 Brig.
2nd Wisconsin Infantry Regiment Colonel P. S. Coon From NE VA, 1 Div. 3 Brig.
Fort Runyan
21st New York Infantry Regiment Colonel William F. Rogers from Dept. Washington 8/4
Fort Ellsworth
17th New York Infantry Regiment Colonel H. Seymour Lansing from Dept. Washington 8/4
Fort Washington
37th New York Infantry Regiment, H&I from Div. Potomac, Hunter’s Brig.
1st United States Artillery, Battery D  Captain J.A. Haskin from Regular Army