United States Armies in the East > Department of Washington


< to June •  July 1861

Commanded by Colonel Joseph K. F. Mansfield

Consolidated with the Department of Northeastern Virginia on July 25, 1861 to create The Department of the Potomac.

6th Maine Infantry Regiment from Maine 7/17
to Smith’s Brig. Div. Potomac 8/4
5th Massachusetts Infantry Regiment Colonel S. C. Lawrence to 1 Brig, 3 Div., Dept. NE Va. 7/3
7th Massachusetts Infantry Regiment from Massachusetts 7/15
to Couch’s Brig. Div. Potomac 8/4
9th Massachusetts Infantry Regiment from Massachusetts 7/3
to Sherman’s Brig. Div. Potomac 8/4
10th Massachusetts Infantry Regiment from Massachusetts 7/25
to Couch’s Brig. Div. Potomac 8/4
1st Minnesota Infantry Regiment Colonel W. A. Gorman to 1 Brig, 3 Div., Dept. NE Va.
1st New Jersey Militia Regiment Colonel A. J. Johnson to 1 Brig, 4 Div., Dept. NE Va.
2nd New Jersey Militia Regiment Colonel H. M. Baker to 1 Brig, 4 Div., Dept. NE Va.
3rd New Jersey Militia Regiment Colonel W. Napton to 1 Brig, 4 Div., Dept. NE Va.
4th New Jersey Militia Regiment Colonel M. Miller to 1 Brig, 4 Div., Dept. NE Va.
5th New York State Militia Colonel C. Schwarzwaelder to Dept. Penn., 3 Div., 8 Brig. 7/10
11th New York Infantry Regiment Colonel N. L. Farham to 2 Brig., 3 Div., Dept. NE Va. 7/13
12th New York State Militia Colonel Daniel Butterfield to Dept. Penn., 3 Div.-8 Brig. 7/6
14th New York Infantry Regiment Colonel J. McQuade to Sherman’s Brig., Dept. Potomac 8/4
15th New York Infantry Regiment Colonel J. M. Murphy to McCunn’s Bde. 7/20 (see below)
17th New York Infantry Regiment Colonel H. Seymour Lansing to Fort Ellsworth 8/4
19th New York Infantry Regiment Colonel John S. Clarke to Dept. Penn., 3 Div., 8 Brig. 7/6
21st New York Infantry Regiment Colonel William F. Rogers to Fort Corcoran 8/4
22nd New York Infantry Regiment Colonel Walter Phelps, Jr. from New York via Baltimore 7/1
to Keyes’ Brig. Div. Potomac 8/4
23rd New York Infantry Regiment Colonel Henry C. Hoffman from New York 7/8
24th New York Infantry Regiment Colonel T. Sullivan from New York 7/3
to Keyes’ Brig. Div. Potomac 8/4
25th New York State Militia Colonel M. K. Bryan left for New York to muster out 8/4
25th New York Infantry Regiment Colonel James E. Kerrigan to McCunn’s Brig. 7/21 (below)
26th New York Infantry Regiment Colonel William H. Christian to McCunn’s Brig. 7/21 (below)
28th New York Infantry Regiment Colonel Dudley Donnelly to Dept. Pennsylvania, 3 Div., 8 Brig. 7/11
33rd New York Infantry Regiment Colonel Robert F. Taylor from New York 7/9
to Smith’s Brig. Div. Potomac 8/4
34th New York Infantry Regiment Colonel W. La Due from New York 7/5
to Stone’s Brig. Div. Potomac 8/4
35th New York Infantry Regiment Colonel William C. Brown from New York 7/9
to 2 Brig., 2 Div., Dept. NE Va. 7/27
36th New York Infantry Regiment Colonel C. H. Innes from New York 7/14
to Couch’s Brig., Dept. Potomac 8/4
37th New York Infantry Regiment Colonel John H. McCunn to McCunn’s Bde. 7/21 (see below)
40th New York Infantry Regiment Colonel Edward J. Riley from New York 7/4
to Howard’s Brig., Div. Potomac 8/4
42nd New York Infantry Regiment Colonel William D. Kennedy from New York 7/18
to Howard’s Brig., Div. Potomac 8/4
25th Pennsylvania Infantry Regiment Companes A, B, C, E, H under individual company commanders left for Harrisburg to muster out 7/26
26th Pennsylvania Infantry Regiment Colonel William F. Small to Hooker’s Brig. Div. Potomac 8/4
Stone’s Command Colonel Charles P. Stone
1st New Hampshire Infantry Regiment Colonel Mason Tappan to Dept. Pa., 3 Div., 7 Brig. 7/7
9th New York State Militia Regiment Colonel John W. Stiles
17th Pennsylvania Infantry Regiment Colonel Francis E. Patterson
25th Pennsylvania Infantry Regiment
Companies D, F, G, I and K
Colonel Henry L. Cake
District of Columbia (detatchments) Captain Smead
United States Cavalry Captain Magruder
4th United States Artillery Battery F Lieutenant Alexander Piper
McCunn’s Brigade Colonel John H. McCunn
15th New York Infantry Regiment Colonel J. M. Murphy from unattached 7/20 (above)
to Couch’s Brig., Div. Potomac 8/4
25th New York Infantry Regiment Colonel James E. Kerrigan from unattached 7/21 (above)
to Hunter’s Brig., Div. Potomac 8/4
26th New York Infantry Regiment Colonel William H. Christian from unattached 7/21 (above)
to Heintzelman’s Brig., Div. Potomac 8/4
37th New York Infantry Regiment Colonel John H. McCunn from unattached 7/21 (above)
to Hunter’s Brig., Div. Potomac 8/4