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>This section under construction<
Created on June 9, 1963 in response to the Confederaacy’s developing invasion of Maryland and Pannsylvania. The Department consisted of all troops east of Johnstown and the Laurel Highlands in Pennsylvania, with headquarters in Chambersburg. The troops were intended to consist of newly raised militia units bolstered by a few veteran regiments.
Commanded by Major General Darius N. Couch
| 1st Brigade, 1st Division (Dana) | Yates | |
| 8th New York National Guard | Colonel Joshua M. Varian | Mustered out 7/23 |
| 5th New York National Guard | Colonel Louis Burger | returned to New York 7/17 |
| 2nd Brigade | ||
| 13th New York National Guard | Colonel John B. Woodward | Mustered out 7/21 |
| 28th New York National Guard | Colonel Michael Bennett | to New York 7/1 |
| 3rd Brigade | ||
| 23rd New York National Guard | Colonel William Everdell, Jr. | Mustered out 7/22 |
| 52nd New York National Guard | Colonel Matthias Cole | ]Mustered out 7/22 |
| 56th New York National Guard | Colonel John Q. Adams | Mustered out 7/24 |
| 4th Brigade | ||
| 11th New York National Guard | Colonel Joachim Maidhof | Mustered out 7/20 |
| 22nd New York National Guard | Colonel Lloyd Aspinwall | 7/8 to 3 Brig. 2 Div. 6 Corps Army Potomac |
| 37th New York National Guard | Colonel Charles Roome | Mustered out 7/22 |
| 5th Brigade | ||
| 68th New York National Guard | Colonel David S. Forbes, | Mustered out 7/25 |
| Pierce’s Brigade | ||
| 1st New York Cavalry Regiment | Colonel Andrew T. McReyolds | to Dept. WV 7/30 |
| 12th Pennsylvania Cavalry Regiment | from Middle Dept. (8 Corps) | |
| Unassigned or unknown | ||
| 4th New York National Guard | Colonel Daniel W. Teller | mustered out 7/24 |
| 67th New York National Guard | Colonel Chauncey Abbott | to NY to muster out 7/30 |
| 74th New York National Guard | Colonel Watson A. Fox | to NY to muster out 7/30 |
| Patapsco Maryland Guards | At Chambersburg, Pottsville and Phillipsburg, Pa. in July; Action at Chambersburg July 29-30; In Juniata District August; mustered out August 17 | from Middle Dept. (8 Corps) |
| 26th Pennsylvania Militia Infantry | Colonel William S. Jennings | mustered out 7/31 |
| 10th New Jersey Infantry Regiment | Philadelphia, Pa. | from 3rd Brigade, 1st Division, 7th Army Corps, Dept. of Virginia |
| On provost duty at Pottsville, Pa. | ||
| Guard fords of the Potomac at and near Shepherdstown | ||
| Mauch Chunk. Pa., Sub-District of Carbon | to 1st Brigade, 1st Division, 6th Corps, Army of the Potomac April 1864 | |