[Chu was the personal name of Chuan Chu, a native of the Wu State and contemporary with Sun Tzŭ himself, who was employed by Kung-tzu Kuang, better known as Ho Lu Wang, to assassinate his sovereign Wang Liao with a dagger which he secreted in the belly of a fish served up at a banquet. He succeeded in his attempt, but was immediately hacked to pieces by the king’s bodyguard. This was in 515 B.C. The other hero referred to, Ts’ao Kuei (or Ts’ao Mo), performed the exploit which has made his name famous 166 years earlier, in 681 B.C. Lu had been thrice defeated by Ch’i, and was just about to conclude a treaty surrendering a large slice of territory, when Ts’ao Kuei suddenly seized Huan Kung, the Duke of Ch’i, as he stood on the altar steps and held a dagger against his chest. None of the duke’s retainers dared to move a muscle, and Ts’ao Kuei proceeded to demand full restitution, declaring the Lu was being unjustly treated because she was a smaller and a weaker state. Huan Kung, in peril of his life, was obliged to consent, whereupon Ts’ao Kuei flung away his dagger and quietly resumed his place amid the terrified assemblage without having so much as changed color. As was to be expected, the Duke wanted afterwards to repudiate the bargain, but his wise old counselor Kuan Chung pointed out to him the impolicy of breaking his word, and the upshot was that this bold stroke regained for Lu the whole of what she had lost in three pitched battles.] 29. The skilful tactician may be likened to the _shuai-jan_. Now the _shuai-jan_ is a snake that is found in the Ch‘ang mountains. ["_Shuai-jan_" means "suddenly" or "rapidly," and the snake in question was doubtless so called owing to the rapidity of its movements. Through this passage, the term in the Chinese has now come to be used in the sense of "military manœuvers."] Strike at its head, and you will be attacked by its tail; strike at its tail, and you will be attacked by its head; strike at its middle, and you will be attacked by head and tail both. 30. Asked if an army can be made to imitate the _shuai-jan_, [That is, as Mei Yao-ch’en says, "Is it possible to make the front and rear of an army each swiftly responsive to attack on the other, just as though they were part of a single living body?"] I should answer, Yes. For the men of Wu and the men of Yüeh are enemies; [Cf. VI. § 21.] yet if they are crossing a river in the same boat and are caught by a storm, they will come to each other’s assistance just as the left hand helps the right. [The meaning is: If two enemies will help each other in a time of common peril, how much more should two parts of the same army, bound together as they are by every tie of interest and fellow-feeling. Yet it is notorious that many a campaign has been ruined through lack of cooperation, especially in the case of allied armies.] 31. Hence it is not enough to put one’s trust in the tethering of horses, and the burying of chariot wheels in the ground.