Art of War 11.51

過則從 is rendered by Capt. Calthrop: “to pursue the enemy if he retreat.” But 過 cannot mean “to retreat.” Its primary sense is to pass over, hence to go too far, to exceed or to err. Here, however, the word has lost all implication of censure, and appears to mean “to pass the boundary line dividing safety from danger,” or, as Chang Yü puts it, 深陷于危難之地 “to be deeply involved in a perilous position.” The latter commentator alludes to the conduct of Pan Ch‘ao’s devoted followers in 73 A.D. The story runs thus in the Hou Han Shu, ch. 47, fol. 1 vo: “When Pan Ch‘ao arrived at 鄯善 Shan-shan, 廣 Kuang, the King of the country, received him at first with great politeness and respect; but shortly afterwards his behaviour underwent a sudden change, and he became remiss and negligent. Pan Ch‘ao spoke about this to the officers of his suite: ‘Have you not noticed,’ he said, ‘that Kuang’s polite intentions are on the wane? This must signify that envoys have come from the Northern barbarians, and that consequently he is in a state of indecision, not knowing with which side to throw in his lot. That surely is the reason. The truly wise man, we are told, can perceive things before they have come to pass; how much more, then, those that are already manifest!’ Thereupon he called one of the natives who had been assigned to his service, and set a trap for him, saying: ‘Where are those envoys from the Hsiung-nu who arrived some days ago?’ The man was so taken aback that between surprise and fear he presently blurted out the whole truth. Pan Ch‘ao, keeping his informant carefully under lock and key, then summoned a general gathering of his officers, thirty-six in all, and began drinking with them. When the wine had mounted into their heads a little, he tried to rouse their spirit still further by addressing them thus: ‘Gentlemen, here we are in the heart of an isolated region, anxious to achieve riches and honour by some great exploit. Now it happens that an ambassador from the Hsiung-nu arrived in this kingdom only a few days ago, and the result is that the respectful courtesy extended towards us by our royal host has disappeared. Should this envoy prevail upon him to seize our party and hand us over to the Hsiung-nu,

our bones will become food for the wolves of the desert. What are we to do?’ With one accord, the officers replied: ‘Standing as we do in peril of our lives, we will follow our commander through life and death’ (今在危亡之地死生從司馬).” For the sequel of this adventure, see chap. XII. § 1, note.