There were two Samuel Wilsons with the PA 100th Vol Inf. Neither was Samuel A. One was Samuel B and the other was Samuel F. No hometown given for either. One killed at Spotsylvania, VA on 12 May 1864 and the other killed 6 March 1864. No place given. There is a set of books called the History of PA Volunteers. You might try a big library for these books. The site I use is: www.civilwardata.com. Costs $10 for one visit or $25 for a year's subscription. The site isn't complete, and they are missing some people. I know all the information about my Grandad's uncle, but he isn't listed. So--that doesn't mean Sam'l A Wilson didn't serve with the 100th. Oh yes, I don't think he could have been born in 1849and have gone back to PA at the beginning of the war. Want me to look for anything else? Barbara Jameson