United States Armies in the East > Department of Washington
< to April • May 1861 • to June >
Commanded by Colonel Joseph K. F. Mansfield
| 1st Connecticut Infantry Regiment | Lieutenant Colonel Speidel | from Connecticut mid-May |
| 2nd Connecticut Infantry Regiment | Colonel A. H. Terry | from Connecticut mid-May |
| 3rd Connecticut Infantry Regiment | Colonel J. Chatfield | from Connecticut mid-May |
| 5th Massachusetts Infantry Regiment | Colonel S. C. Lawrence | from Massachusetts 5/1 |
| 1st Michigan Infantry Regiment | Colonel O. O. Wilcox | from Michigan 5/24 |
| 1st New Hampshire Infantry Regiment | Colonel Mason Tappan | from New Hampshire 5/28 |
| 1st New Jersey State Militia | Colonel A. J. Johnson | from Trenton via Annapolis 5/6 |
| 2nd New Jersey State Militia | Colonel H. M. Baker | from Trenton via Annapolis 5/6 |
| 3rd New Jersey State Militia | Colonel W. Napton | from Trenton via Annapolis 5/6 |
| 4th New Jersey State Militia | Colonel M. Miller | from Trenton via Annapolis 5/6 |
| 5th New York State Militia | Colonel C. Schwarzwaelder | from New York 5/1 |
| 7th New York State Militia | Colonel M. Lefferts | From Dept. Annapolis 5/12 5/31 to New York to muster out |
| 8th New York State Militia | Colonel George Lyons | |
| 9th New York State Militia | Colonel John W. Stiles | from New York 5/27 |
| 11th New York Infantry Regiment | Colonel E. Ellsworth (k 5/24) Lt. Colonel N. L. Farham |
from New York 5/4 |
| 12th New York State Militia | Colonel Daniel Butterfield | from New York via Annapolis 5/1 |
| 14th New York State Militia | Colonel A. M. Wood | from New York 5/18 |
| 25th New York State Militia |
Colonel M. K. Bryan | |
| 69th New York State Militia | Colonel Michael Corcoran | from Dept. Annapolis 5/2 |
| 71st New York State Militia |
Col. A. S. Vosberg (died 5/20) Colonel H. P. Martin |
arrived from Annapolis 4/26 |
| 1st Ohio Infantry Regiment | Colonel A. McCook | |
| 2nd Ohio Infantry Regiment | Colonel L. Wilson | |
| 17th Pennsylvania Infantry Regiment | Colonel Francis E. Patterson | from Baltimore 5/10 |
| 25th Pennsylvania Infantry Regiment | Colonel Henry L. Cake | |
| 1st Rhode Island Infantry Regiment | Colonel A. Burnside | |
| 4th United States Artillery, Battery F |