23rd Regiment, Pennsylvania Infantry (3 months, 1861)

Historical Sketch:
Col., Charles P. Dare; Lieut.-Col., David B. Birney; Maj., George C. Spear. The 23d was a Philadelphia militia regiment and was mustered into the national service in that city, April 21, 1861, for a three months' term. The same day it was ordered to Perryville and was posted along the Philadelphia, Wilmington & Baltimore railroad on guard duty until May 28, when it was relieved and proceeded to Chambersburg, where it was assigned to the 1st brigade, 1st division of Gen. Patterson's army. It followed the already described route of this force; engaged the enemy at Falling Waters, and was mustered out at Philadelphia on July 31. Roster:
The Roster of this unit contains the names of 781 men.
Source:
The Union Army by Federal Publishing Company, 1908 - Volume 1
Bibliography:

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Blair, William and William Pencak, editors. Making and Remaking Pennsylvania's Civil War. University Park, Pennsylvania: Penn State University Press, 2004.

Fox, Arthur B. Our Honored Dead: Alleghany County, Pennsylvania, in the American Civil War. Chicora, Pennsylvania: Mechling Bookbindery, 2008.

Fox, Arthur B. Pittsburgh During the American Civil War 1860–1865. Chicora, Pennsylvania: Mechling Bookbindery, 2002.

Greater Chambersburg Chamber of Commerce. Southern Revenge: Civil War History of Chambersburg, Pennsylvania. Chambersburg, Pennsylvania: Greater Chambersburg Chamber of Commerce, 1989.

Miller, William J. The Training of an Army: Camp Curtin and the North's Civil War. Shippensburg, Pennsylvania: White Mane, 1990.

Sandou, Robert M. Deserter County: Civil War Opposition in the Pennsylvania Appalachians. Fordham University Press, 2009.

Skinner, George W., ed. Pennsylvania at Chickamauga and Chattanooga: Ceremonies at the Dedication of the Monuments Erected by the Commonwealth of Pennsylvania. Harrisburg, Pennsylvania: Wm. Stanley Ray, State Printer, 1897.

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Young, Ronald C. Lancaster County, Pennsylvania in the Civil War. Lancaster, Pennsylvania: published by the author, 2003.