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Commanding Officer on the Antietam Campaign:
Capt. George E. Seymour
This Regiment's Chain of Command:
Army - Army of the Potomac
Corps - Twelfth Army Corps
Division - 2nd Division, 12th Corps
Brigade - 2nd Brigade, 2nd Division, 12th Corps
Unit history
Early in December, 1861, recruiting for this regiment was commenced, under the direction of Henry J. Stainrook, a citizen of Chester county. Headquarters and barracks were established on Chestnut street, Philadelphia, opposite the State House, and with the exception of two companies, the regiment was recruited in that city. It was organized with the following field officers, their commissions dating from November 8th, 1861: Henry J. Stainrook, Colonel; Charles I. Harris, Lieutenant Colonel; William A. Gray, Major .
On the Antietam Campaign
Captain Seymour leading the regiment, it marched through Washington and entered on the Maryland campaign, reaching Frederick on the 13th [September]. In the battles of South Mountain and Antietam the One Hundred and Ninth did not actively engage, being still held for duty with the trains (detached from the Brigade on 9 September).1
References & Notes
Source: Bates, Samuel P., History of the Pennsylvania Volunteers, 1861-65, Harrisburg, 1868-1871.; Extracted online at the Pennsylvania in the Civil War site.
We have one individual in the AotW database who was on the Maryland Campaign with this unit:
| Co. | Rank | Name | Casualty? | Details* |
|---|---|---|---|---|
| A | Capt | Seymour, George E |  |
* If there's a symbol in the Details column ...
- We have a picture for this person - We have details beyond name and rank
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1 US War Department, The War of the Rebellion: a Compilation of the Official Records of the Union and Confederate Armies (OR), 128 vols., Washington DC: US Government Printing Office, 1880-1901, Vol. 19/Part 1 (Ser #27) , Pg. 179 [AotW citation 136]