Commanding Officer on the Antietam Campaign:
Capt. George E. Seymour
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:
|A||Capt||Seymour, George E|
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