quick thought.....the Seminole Indians used to put four small logs with all four ends touching....like the N,S,E,W of a compass....when the American troops were heard coming near, they Seminoles would pull the logs away from each other to extinguish the fire...when trouble passed, they slid them back together and it rekindled. They were in the everglades though, which provided a screen above in many ways. Just a thought.