You lucked out. I've well over 500 volumes on the Civil War and other than it being a Union source, I didn't know where to begin.
It comes from page 137 (revised and enlarged 1905 edition published by F. McManus, Jr. & Co. of Philadelphia) of Lieutenant-Colonel Thomas Chamberlin's book, "History of the One Hundred and Fiftieth Regiment Pennsylvania Volunteers, Second Regiment, Bucktail Brigade."
Page 330 states Pvt. Terrance O'Conner enlisted as a private in Capt. George W. Jones' Company B and was mustered in on Aug. 19, 1862. He was promoted to Corporal on May 1, 1865 and mustered out with his company on June 23, 1865 and died in 1896. Jones' company was raised in Germantown (page 19) and was to have been a flank company (p25). They were armed with Enfield rifles (p 29).
You owe me a beer.
Vigilantibus et non dormientibus jura subveniunt. Molon Labe!