Gettysburg — the soldier who showed up in the photo and nobody knows who he is

I know, Gettysburg, everyone's heard of it, 50,000+ casualties over three days in 1863, most documented battle in American history, blah blah. But there's one specific thing that keeps me up: the Humiston photograph. Dr. Bourns found the body of an unknown Union soldier at Gettysburg holding a tinty……