United States Armies in the East > Department of Pennsylvania
< to June • July 1861 • to August >
Commanded by:
Major General Robert Patterson (to July 25)
Major General John A. Dix
The Department of Pennsylvania merged with the Department of Maryland on July 25. General Order #46 honorably discharged Generals Patterson and Cadwallader at the end of their terms of service on July 27th, and almost all of the troops of Patterson’s army mustered out at that time. Thus General Dix and his troops from Maryland (which became known as Dix’s Division) became the Department of Pennsylvania.
1st Division |
Brigadier General George Cadwalader | |
| 1st Brigade | Colonel George Thomas | |
| 6th Pennsylvania Infantry Regiment | Colonel James Nagle | to Harrisburg 7/18 for muster out |
| 21st Pennsylvania Infantry Regiment | Colonel John F. Ballier | to Philadelphia 7/31 for muster out |
| 23rd Pennsylvania Infantry Regiment | Colonel Charles P. Dare | to Philadelphia 7/20 for muster out |
| Philadelphia City Troop Cavalry | Captain Thomas James | |
| 2nd United States Cavalry (Cos. ACF&K) | to Dep. Shenandoah – 1st Brig. | |
| 4th U.S. Artillery (detatchment) | Captain Abner Doubleday | 1 8″ howitzer and 1 24-pounder |
| 3rd Brigade | Brigadier General Alpheus S. Williams | |
| 7th Pennsylvania Infantry Regiment | Colonel William I. Irwin | to Harrisburg 7/22 for muster out |
| 8th Pennsylvania Infantry Regiment | Colonel A.H. Emley | to Harrisburg 7/22 for muster out |
| 10th Pennsylvania Infantry Regiment | Colonel Sullivan A. Meredith | to Harrisburg 7/23 for muster out |
| 20th Pennsylvania Infantry Regiment | Colonel Wiliam H. Gray | to Philadelphia 7/24 for muster out |
| 4th Brigade | Colonel J. C. Longenecker (until 7/2) Colonel Dixon S. Miles |
|
| 9th Pennsylvania Infantry Regiment | Colonel Henry C. Longnecker | to Harrisburg 7/21 for muster out |
| 13th Pennsylvania Infantry Regiment | Colonel Thomas A. Rowley | to Harrisburg 7/21 for muster out |
| 16th Pennsylvania Infantry Regiment | Colonel Thomas A. Ziegle | to Harrisburg 7/21 for muster out |
2nd Division |
Major General William H. Keim | |
| 2nd Brigade | Brigadier General G. C. Wynkoop | |
| 1st Pennsylvania Infantry Regiment | Colonel Samuel Yohe | to Harrisburg 7/23 for muster out |
| 2nd Pennsylvania Infantry Regiment | Colonel Frederick S. Stumbaugh | to Harrisburg 7/23 for muster out |
| 3rd Pennsylvania Infantry Regiment | Colonel Francis P. Minier | to Harrisburg 7/23 for muster out |
| Fifth Brigade | Brigadier General J. S. Negley | |
| 14th Pennsylvania Infantry Regiment | Colonel John W. Johnston | to Harrisburg 7/21 for muster out |
| 15th Pennsylvania Infantry Regiment | Colonel R.A. Oakford | to Harrisburg 7/25 for muster out |
| 24th Pennsylvania Infantry Regiment | Colonel Joshua T. Owen | Early Aug. – to Harrsburg for muster out |
| Sixth Brigade | Colonel John J. Abercrombie | |
| 4th Connecticut Infantry Regiment | Colonel Levi Woodhouse | to Dep. Shenandoah – 2nd Brig. |
| 2nd Massachusetts Infantry Regiment | Colonel George H. Gordon | from Massachusetts early July 7/25 to Dep. Shenandoah – 2nd Brig. |
| 11th Pennsylvania Infantry Regiment | Colonel Pharon Jarrett | to Harrisburg 7/27 for muster out |
| 1st Wisconsin Infantry Regiment | Colonel Starkweather | to Dep. Shenandoah – 1st Brig. |
3rd Division |
Major General C. P. Sandford | created 6/1 |
| 7th Brigade | Colonel Charles P. Stone | to Dept. Shenandoah, 3rd Brig. |
| 1st New Hampshire Infantry Regiment | Colonel Mason Tappan | from Dept. Washington to Dept. Shenandoah, 3rd Bde. |
| 9th New York State Militia Regiment | Colonel John W. Stiles | from Dept. Washington to Dept. Shenandoah, 3rd Bde. |
| 17th Pennsylvania Infantry Regiment | Colonel Francis E. Patterson | 7/7 from Dept. Washington to Philadelphia 7/23 to muster out |
| 25th Pennsylvania Infantry Regiment (Companies D, F, G, I and K) |
Colonel Henry L. Cake | 7/01 from Dept. Washington to Philadelphia 7/23 for muster out |
| District of Columbia Infantry (det.) | Captain Smead | 7/7 from Dept. Washington |
| United States Cavalry (detachment) | Captain Magruder | 7/7 from Dept. Washington |
| 4th United States Artillery Battery F | Lieutenant Alexander Piper | to Dept. Shenandoah, 3rd Bde. |
| 8th Brigade | Colonel Daniel Butterfield | created July 10 |
| 5th New York State Militia | Colonel C. Schwarzwaelder | from Dept. Washington 7/10 to New York 7/30 for muster out |
| 12th New York State Militia | Colonel Daniel Butterfield | from Dept. Washington 7/6 to New York 7/30 for muster out |
| 19th New York Infantry Regiment | Colonel John S. Clarke | from Dept. Washington 7/6 to Dept. Shenandoah, 1st Bde. |
| 28th New York Infantry Regiment | Colonel Dudley Donnelly | from Dept. Washington 7/11 to Dept. Shenandoah, 1st Bde. |
| Philadelphia, Pennsylvania City Troop | Captain Thomas James | to Dept. Shenandoah, 1st Brig. |
Unattached |
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| 11th Indiana Infantry Regiment | Colonel Lew Wallace | from Cumberland, Md. 7/8 to Indianapolis 7/29 for muster out |
| 1st United States Artillery, Battery E | ||
| 1st United States Artillery, Battery H | ||
* Generals Keim, Negley and Wynkoop were commissioned in the Pennsylvania Militia. Colonels Abercrombie, Miles and Thomas were commissioned in the United States Army
After July 25
Dix’s Division |
||
| 1st Delaware Militia | Colonel Henry H. Lockwood | |
| 6th Massachusetts Infantry Regiment | Colonel Edward F. Jones | returned to Mass. to muster out 7/29 |
| 3rd New York Infantry Regiment | Lt. Colonel Samuel M. Alford | from Dept. of VA 7/30 |
| 4th New York Infantry Regiment | Colonel Alfred W. Taylor | from Dept. of VA 7/25 |
| 5th New York Infantry Regiment | Colonel C. Schwartzwaelder | from Dept. of VA 7/26 |
| 6th New York Militia Regiment | Colonel Joseph Pinckney | returned to New York 7/29 |
| 13th New York State Militia | Colonel Abel Smith | returned to New York 7/31 |
| 20th New York State Militia | Colonel George W. Pratt | returned to New York 7/31 |
| 1st Pennsylvania Reserves | Colonel R. Biddle Roberts | from Harrisburg 7/22 |
| 12th Pennsylvania Infantry Regiment | Colonel David Campbell | |
| 18th Pennsylvania Infantry Regiment | Colonel William D. Lewis | to Philadelphia 7/29 for muster out |
| 19th Pennsylvania Infantry Regiment | Colonel Peter Lyle | |
| 22nd Pennsylvania Infantry Regiment | Colonel Turner G. Morehead | |
| Cook’s Boston, Ma. Battery | ||
| 2nd United States Artillery, Battery I | at Fort McHenry |