Xiahou Ba

Xiahou Ba is a Wei general whose revolt against Sima Yi brings him into the service of Shu Han. His defection briefly gives Jiang Wei an opening to consider attacking a politically disrupted Wei, but Xiahou Ba’s final campaign ends in a trap at Taoyang, where he and nearly all his men are lost.

Defection from Wei

After Sima Yi consolidates power, he summons Xiahou Xuan, a surviving member of the Cao clan whom he regards as a possible threat. This move prompts Xiahou Ba, Xiahou Xuan’s uncle, to rebel. He crosses the border with three thousand men and offers his services to Shu Han’s ruler.

Jiang Wei is initially doubtful about receiving him. Xiahou Ba explains that Sima Yi is preoccupied with taking control of Wei and is unlikely to invade Shu immediately. His arrival thus supplies both a political signal and a strategic assessment: Wei’s internal upheaval may create a limited opportunity for its rival.

Jiang Wei’s invasion

Xiahou Ba’s report helps inspire Jiang Wei to propose an attack before Wei has settled its affairs. Fei Yi objects, but the ruler approves the plan, and Jiang Wei, supported by Xiahou Ba, moves to Hanzhong to prepare. The campaign proves disastrous. Shu’s forts lack sufficient water to withstand sieges, and the Wei commander Chen Tai repeatedly outmanoeuvres the invading army, while Guo Huai attacks with particular force.

The episode shows the limits of what Xiahou Ba’s defection can achieve. His knowledge of Wei’s political distractions encourages an offensive, but it cannot overcome the practical weaknesses of Shu’s preparations or the effectiveness of Wei’s response. The opportunity created by Sima Yi’s consolidation is real but short-lived.

Death at Taoyang

In the winter campaign of AD 263, Jiang Wei again invades Wei, despite opposition from the Shu ruler and council. Xiahou Ba is sent to seize Taoyang as part of a plan intended to draw Deng Ai and his army away from another target. The city appears deserted, and people are seen fleeing through a rear gate; once Xiahou Ba enters, however, Wei soldiers appear on the walls and close the gates.

Xiahou Ba dies in the trap, along with almost all the Shu soldiers caught inside. Deng Ai follows the success with a night raid on Jiang Wei’s camp, further disorganizing the Shu army. Jiang Wei manages to gain an advantage in their later contest, but repeated orders recall him to the capital, and the campaign ends without the victory he had nearly secured. Xiahou Ba’s final mission therefore marks a sharp reversal: the veteran defector who had helped prompt an invasion becomes one of its earliest and most consequential losses.