My mom is Charles William Berget's great, great, great granddaughter. The story she was told growing up was that Charles killed a man around the same time of the Civil War, and moved down south (Dover, Ar) and changed his name to Donahou. I like you are stuck on the fact about him in the 87th etc. . I can not find anything else on him. If you have found some more information, please let me know where at and I will share all of the information I have about him.