in the darkness, Su Pingbei's military orders are conveyed layer by layer in the form of gestures to ensure that everyone can understand what Su Pingbei means.,the north of Su Ping gave a loud drink, like a thunderbolt on the flat ground, reverberating in the canyon.,the soldiers ambushed on the edge of the cliff riveted hard and pushed the prepared boulders around them off the cliff. When the stones were finished, they took out the tung oil they carried with them. Each soldier could not carry much tung oil, that is, the quantity of three kettles, but it could not hold a large number of people.。