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We met with no Indians, but we found the places on the neighboring hills where they had lain to watch our proceedings. There was an art in their contrivance of those places, that seems worth mention. It being winter, a fire was necessary for them; but a common fire on the surface of the ground would by its light have discovered their position at a distance. They had therefore dug holes in the ground about three feet diameter, and somewhat deeper; we saw where they had with their hatchets cut off the charcoal from the sides of burnt logs lying in the woods. With these coals they had made small fires in the bottom of the holes, and we observ'd among the weeds and grass the prints of their bodies, made by their laying all round, with their legs hanging down in the holes to keep their feet warm, which, with them, is an essential point. This kind of fire, so manag'd, could not discover them, either by its light, flame, sparks, or even smoke: it appear'd that their number was not great, and it seems they saw we were too many to be attacked by them with prospect of advantage.
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Benjamin Franklin (The Complete Harvard Classics - ALL 71 Volumes: The Five Foot Shelf & The Shelf of Fiction: The Famous Anthology of the Greatest Works of World Literature)