The Restoration of the Shu–Wu alliance reverses Wu’s expected participation in a Wei-led attack on Shu and re-establishes cooperation through diplomacy. Deng Zhi’s composure before Sun Quan, Lu Xun’s counsel against joining the campaign, and Kong Ming’s agreement to the terms turn a threatened encirclement into a renewed partnership against Wei.

Causes and Strategic Setting

The alliance takes shape as Cao Pi prepares a multi-front assault on Shu, hoping that Wu will contribute a fifth army. But Lu Xun’s standing in Wu has risen after his victory over Wei, and he predicts that the four armies Cao Pi has ordered will fail. Sun Quan accepts Lu Xun’s judgment and withholds Wu’s forces from the planned attack, so the coalition Cao Pi hoped to assemble is already weakened before Shu’s envoy arrives.

The decision reflects the strategic importance of Wu’s position. Earlier, Kong Ming had advised Xuande to regard Sun Quan’s southern power as a potential ally rather than an enemy: Wu had popular support, even if it was not as powerful as Cao Cao’s northern forces. The renewed pact puts that strategic logic into practice. Instead of allowing Wei to exploit division between Shu and Wu, the two states agree to coordinate against their common opponent.

Deng Zhi’s Mission

When Deng Zhi arrives as Shu’s envoy, Sun Quan’s advisers suspect that the mission is another stratagem devised by Kong Ming. The reception makes the suspicion a test of nerve: armed guards line Deng Zhi’s path toward a cauldron of boiling oil, creating the appearance that he may be in danger. Deng Zhi remains composed and answers the implied threat by bluntly criticizing Wu’s pettiness. His calm response impresses Sun Quan, shifting the encounter from intimidation toward negotiation.

Deng Zhi then argues that Wu’s interests are better served by partnership with Shu. Sun Quan is persuaded sufficiently to send one of his own men back with the envoy to negotiate the agreement. The episode makes diplomacy, rather than force, the immediate means by which Shu prevents its isolation. Deng Zhi’s conduct is decisive not because he commands troops, but because he withstands a staged test and wins Sun Quan’s attention.

Agreement and Consequences

Kong Ming agrees that the alliance will be forged if Deng Zhi returns with an envoy from Wu. That condition is met, and the two sides sign the agreement. The arrangement renews the Shu–Wu partnership against Wei and confirms that Sun Quan will not supply the additional force Cao Pi wanted for his campaign against Shu.

The diplomatic success angers Cao Pi, who recognizes that the renewed partnership threatens Wei. He asks for advice and is told to wait ten years, using that time to develop military agricultural colonies so that the army can secure its own supplies for a future campaign. Cao Pi rejects the delay and orders preparations to proceed immediately. By autumn 224, he has assembled land and naval forces said to number more than three hundred thousand, including ten large dragon boats and three thousand warships. The alliance does not end the military contest; it changes its balance by denying Wei the expected support of Wu and making the prospect of a united Shu–Wu front explicit.

Narrative Significance

The episode is a contest over whether Wei can turn the political division of the realm into a military advantage. Cao Pi’s plan depends on drawing Wu into an attack on Shu; Lu Xun’s prediction and Sun Quan’s decision defeat that premise before the invasion begins. Deng Zhi’s mission then converts Wu’s non-participation into an affirmative agreement with Shu, giving strategic consequence to a diplomatic exchange.

The alliance also recalls Kong Ming’s earlier counsel to Xuande: the southern ruler was to be treated as a possible partner, not a permanent foe. Here that principle is carried forward by Kong Ming’s conditional approval and Deng Zhi’s successful negotiation. Against Wei’s preparations for a massive campaign, the renewed pact shows how a shift in allegiance can alter the shape of war before armies meet.