A Tennessee man digging in his backyard garden over the weekend found 13 tombstones that have been traced to a historic military cemetery. Jason Blackburn, a nurse at the Baptist Memorial Hospital for Women in Memphis, was clearing a walkway that leads to his dog's pen when he dug up a tombstone below some 3 inches of dirt. At first he mistook it for a garden stone, the Memphis Commercial Appeal reported. “My first reaction was, ‘Oh my goodness, I hope there's not dead bodies in my backyard,” Blackburn told the newspaper. “I mean that's the first reaction when you're digging in your backyard and you find tombstones.” Blackburn searched a name on one of the gravestones — Pvt. Arthur Woodson — on the Internet and determined it was linked to Memphis National Cemetery, a historic memorial park that goes back to the Civil War and is now run by the Department of Veterans Affairs.