Introduction to Pit No. 1: Pit No. 1 is an east-west rectangular pit, 230 meters long and 62 meters wide, with five doorways on each side. There are long corridors at the east and west ends of the pit, and one corridor on each north and south side. In the middle are nine east-west passages, separated by rammed earth walls. This pit is dominated by vehicles and infantry, with vehicles and infantry forming a rectangular joint formation.