Isaac S. Kerstetter and Isaac J. Kerstetter enlisted in the Union Army from Union County, Pennsylvania, on Aug. 28, 1862, and served in Co. E of the 142nd Pa. Regiment. Isaac S., who I think previously enlised for three months and served with the 4th Pa. Regiment, was later promoted to lieutenant in the 142nd. Can anyone help me by providing more information the two Isaacs? Which of the Issac Kerstetters in Union, Snyder and Northumberland counties at that time were they? Thank you for your help.