If you are wanting to hide a fire, or to use the least amount of wood possible, dig a Dakota fire hole! How? First, you need a reason for the fire, cooking, boiling water, whatever the reason, you now need a cooking vessel. Lets just say for grins, you have a one gallon tin can. Dig the hole just slightly larger than the can so that it can be lowered down into the hole. this implies that you built a handle on the can to do this. Once you get the hole dug down, go upwind and dig a smaller hole at a angle down to the bottom of the hole. The theory is that the wind will travel down the hole and provide the oxygen necessary. Since there is an abundance of oxygen, the wood will burn hotter, thus less wood necessary and less smoke. Works like a champ! Notice the premade tools off to the side for operating the cooking pot. And yes, the magnesium starter works. This was taken the second day of field craft during Survival School. Notice the draft hole for the fire pit.