My own unknown

This is the only photographic record I have of my family's Civil War service. It is a picture of a picture, and a poor one at that. I can tell you from the records that he was very young at the time. That he was a Union - or Confederate soldier. That he was from Arkansas or Illinois. That he lived or was wounded or was captured or was killed. And that his last name was either Bost or Surguy.
You can't change anything with a wish, especially the past, but when I see this picture, I always wish him luck. I can't help myself.