You might try contacting Brad Quinlan who was the first person I heard this story from. He's a well-known historian from the Atlanta area. I imagine you can google him to find a contact number. If not, the Marietta Museum of History in Marietta, GA. could tell you how to reach him.
I give local history tours in Marietta and the story about Lt. Col. Martin is always one of everybody's favorite.
I would love to hear from you if you find more documentation.
Good luck!
Audrey Griffies