United States Armies in the East > Department of Washington
April 1861 • to May >
Commanded by Lieutenant Colonel Charles F. Smith (to 4/27)
Colonel Joseph K. F. Mansfield (after 4/28)
The Department of Washington was established April 9, 1861 to consist of the District of Columba, including its original territory of Alexandria County, Virginia, and the State of Maryland as far as Bladensburg.
The Department of Washington was established April 9, 1861 to consist of the District of Columba, including its original territory of Alexandria County, Virginia, and the State of Maryland as far as Bladensburg.
| 1st Ohio Infantry Regiment | Colonel A. McCook | arrived from Ohio late April |
| 2nd Ohio Infantry Regiment | Colonel L. Wilson | arrived from Ohio late April |
| 1st Rhode Island Infantry Regiment | Colonel A. Burnside | arrived from Rhode Island 4/20 |
| 7th New York State Militia | Colonel M. Lefferts | arrived from New York 4/26 |
| 8th New York State Militia | Colonel George Lyons | from New York 4/20 |
| 12th New York State Militia | Colonel Daniel Butterfield | Arrived from New York 5/23 |
| 25th New York State Militia |
Colonel M. K. Bryan | arrived from Albany 4/29 |
| 71st New York State Militia |
Colonel A. S. Vosberg | arrived from Annapolis 4/26 |
| 25th Pennsylvania Infantry Regiment | Colonel Henry L. Cake | from Harrisburg 4/18 |
| 1st United States Artillery, Battery I | ||
| 1st United States Artillery, Battery D | ||
| 2nd United States Artillery, Battery E | arrived from west 4/18 | |
| 4th United States Artillery, Battery F |