this unexpected scene exhilarates Su Pingbei's spirit.,he knew that the reinforcements, which had been prearranged to attract the attention of the Liao army on the north side, played a role.,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.。