You are searching for an ammo box near the edge of the event field. The hint will help you if you want to use it.
Robert Tombs was a good friend of Alexander Stephens. They were both in the legal profession and socialized frequently. Tombs had a home in nearby Washington, Georgia, but the distance on horseback made a visit an overnight event. You can see the room kept ready for him if you tour Stephens's home.
A park pass is required for park entry. This cache is placed with permission of the park manager.