Jiang Wei sees through Wang Guan’s feigned surrender and defeats Deng Ai

Jiang Wei sees through Wang Guan’s feigned surrender and defeats Deng Ai in a campaign that turns an enemy’s deception into a tactical victory, but not a lasting strategic gain. The Shu army’s losses and depleted supplies force Jiang to retreat to Hanzhong, while Wei responds by rewarding Deng Ai and reinforcing its frontier.

Political Background

After Sima Zhao places Cao Huan on the Wei throne, Jiang Wei argues that the killing of Cao Mao gives Shu grounds to invade and overthrow those responsible. He writes to Wu seeking its participation, then follows the familiar route toward the Qishan hills, where Deng Ai is entrenched. The campaign is thus presented both as a military advance and as an attempt to turn a violation within Wei’s ruling order into a claim for intervention.

Deng Ai’s deputy, Wang Guan, proposes to infiltrate Jiang Wei’s forces by pretending to defect with five thousand men. His stated grievance is that Wang Jing, his uncle, and Wang Guan’s family have been killed. The story later shows this account to be part of the ruse: Wang Guan’s real purpose is to betray Jiang from within.

The Feigned Defection

When Wang Guan arrives claiming he has been driven to defect, Jiang Wei welcomes the apparent opportunity. Xiahou Ba questions the story, noting that he has never heard of Wang Guan and asking whether he is truly related to Wang Jing. Jiang, however, is not taken in. He tells Xiahou Ba that he intends to answer deception with deception, and uses Wang Guan as a channel for false information intended to reach Deng Ai.

The counterplot reverses the direction of the infiltration. Deng Ai receives information purporting to come from Wang Guan and is drawn into an ambush. He is defeated and nearly loses his life. Wang Guan’s attempted escape ends at the Black Dragon River, where he dies. Jiang’s forces capture Wang Guan’s men and bury them alive, a severe consequence of the failed infiltration that marks the episode’s victory as costly as well as cunning.

Victory and Withdrawal

The defeat of Deng Ai’s plot does not erase the strain on Jiang Wei’s army. The engagement has consumed men and supplies, so Jiang turns back and returns to Hanzhong rather than pressing the campaign. The distinction between tactical success and strategic capacity is central to the outcome: Jiang wins the immediate contest of intelligence, but the price leaves him unable to sustain his advance.

Deng Ai asks to be demoted after his defeat, but Sima Zhao instead raises his rank and grants him titles and gifts. Deng Ai rewards his own men, while Sima Zhao, recognizing that the border remains vulnerable, sends him additional troops. The aftermath therefore strengthens Wei’s defensive position even as Jiang’s successful counterplot forces a retreat.

Narrative Significance

The episode makes intelligence and credibility the battlefield’s decisive terrain. Wang Guan’s false grievance is designed to make his defection plausible; Jiang’s advantage comes from identifying the scheme and feeding it misleading information rather than accepting the apparent change of allegiance at face value. Yet the victory is deliberately limited by its material cost: deception can win an encounter without securing the resources needed to continue a war.

The political justification and military result also pull in different directions. Jiang invokes Cao Mao’s killing to legitimate an invasion, but the campaign ends not with the overthrow of Wei’s leaders but with a return to Hanzhong and renewed Wei preparations. The episode thus presents a local triumph whose consequences favor the defense it briefly unsettles.