Zhang Yi, in order to break the Vertical Alliance and promote the Horizontal Alliance for the state of Qin, lobbied King Huai of Chu, saying: "To the west, Chu possesses Qianzhong and Wu Commandery; to the east, Xiazhou and Haiyang; to the south, Dongting and Cangwu; to the north, the Fenxing Pass and Xunyang. Your territory stretches five thousand li in circumference, with a million armored soldiers, a thousand war chariots, ten thousand cavalry horses, and grain enough to sustain you for ten years. These are the very foundations for achieving hegemony. With the might of Chu and the wisdom of Your Majesty, none under heaven can stand against you. Yet now you contemplate serving Qin to the west—if so, all the feudal lords will bow at Qin's Zhangtai Palace. What Qin most desires to weaken is Chu, and none can weaken Chu more than Han. This is not because Han is stronger than Chu, but because of the lie of the land. Now, if Your Majesty serves Qin to the west and attacks Han, Han will surely be reduced to ruins; if you turn east to attack Song, Song will surely become marshland. With the strength of Chu to strike at small states, it is as easy as hurling a stone against eggs. Then the people of Han and Song may all become subjects of Chu. If Your Majesty will heed my counsel, I am willing to ensure that Qin and Chu become brother states forever, never attacking each other. I have heard that one contends for fame at court and for profit in the marketplace. Now the Three Rivers and the House of Zhou are the marketplace and court of all under heaven, yet Your Majesty does not contend for them, but instead strives after the lands of the Rong and Di barbarians—this is far removed from the path of kingship. Your Majesty had better send forth troops to press upon the House of Zhou. Zhou, knowing itself unable to resist, will surely offer up the Nine Tripods and its precious vessels. Qin and Chu shall divide its territory between them, and Your Majesty may then control Qi, Zhao, Yan, and Wei, and to the south proclaim yourself hegemon over the feudal lords—this is the achievement of a true king. I beg Your Majesty to consider this carefully." King Huai of Chu said: "Chu is remote, dwelling by the eastern sea. I am young and unfamiliar with the grand strategies of state. Now that you, honored guest, have graciously instructed me with wise counsel, I have heard it and am willing to entrust my state to your guidance." Thereupon he dispatched a hundred chariots and presented rhinoceros horns of the Ji-hai breed and the luminous jade of the night to the King of Qin.
💡 商战启示录
Zhang Yi's strategy stands as a classic exemplar of "psychological warfare" and "interest restructuring" in the annals of ancient commercial statecraft. With surgical precision, he seized upon King Huai of Chu's vulnerabilities—his underestimation of his own strength and his dread of Qin—and, by weaving together the arts of "exaltation to ruin" (magnifying Chu's might) and "intimidation" (pointing out that Han had been conscripted into Qin's service), transformed the Chu king from a defensive posture of "vertical alliance against Qin" into an offensive stance of "horizontal alliance to strike Han," thereby achieving Qin's strategic objectives. In modern commerce, this tactic finds frequent application in merger negotiations or the maneuvering of industry coalitions. For instance, when a sector's dominant player seeks to dismantle a rival alliance, it may first extol the "formidable strength" of that coalition, only to then expose its internal frailties—such as supply-chain dependencies or overlapping markets—implying that without cooperation, the third party will be "picked off one by one," thereby luring the opponent to abandon its alliance and forge a new partnership with the aggressor. Similarly, in channel negotiations, brand owners often compel distributors to take sides by warning, "If you do not ship our goods, competitors will seize your core market." Zhang Yi's brilliance lay in "enticing with profit, coercing with momentum"—converting the opponent's fear into one's own leverage, and fabricating an illusion of mutual gain through "shared spoils" (the joint division of the Zhou royal house), while in truth monopolizing the strategic advantage. The commercial lesson: in negotiation, first reframe the counterpart's cognitive framework, then present a proposal that appears mutually beneficial yet is in fact dominated by one side—such a move can often alter the landscape without a single blade being drawn.