There are three Jeremiah Sankeys (one has the middle name of Asher not Alexander) in the PA Archives, Civil War cards:
1. Jeremiah Alexander Sankey is born in 1842 he would have been 18 in 1863 or 22 in 1865. No military service record for Militia; Possibly listed in Centre County Militia 1862 (John Blair Linn's book History of Centre County) Owned an inn. This is my direct line.
2. Jeremiah Sankey is 27 years old in 1864 (as corporal) Company L- Regement 3, Artillery, 4-752 Bates reference (this one was a shoemaker and deserted on July 22, 1865)
3. Jeremiah Asher Sankey is 25 years old in 1862, the card records him dying at City Point, VA 3-25-1865 of wounds received in action, from Potter's Mills, Centre county,PA (1st Serg.) Company F- Regiment 3, Artillery, 4-597 Bates ref
(this one was a Farmer from Potter)