search ONE square mile (low brush) for a man who isn't doing more than laying prone. An acre is 30 ft wide, 1/4 mile long, and if you move faster than 1 mph during such a search, you will probably walk right PAST him. If he's got a shallow depression and a field made ghillie suit, you will have to go MUCH slower, and if he's silently KILLING some of you, you will move a LOT slower yet. If he moves a mere .5 mile, which he can do in 1 minute flat, out of your sight) your ENTIRE 1 square mile search wont mean a thing. If the cover is a lot thicker and taller, including hills, you can't search such a square mile PROPERLY in a day, with a score of men. During the night, of course, he can be 10-500 miles GONE, depending upon whether or not he gets to a vehicle.j You will be left stumbing around, searching that same area, for DAYs, wondering if he's getting ready to shoot some more of you.