The Siege of Chencang tests whether Kong Ming can turn a northern campaign into lasting territorial gains. His army initially finds the city strongly defended by Hao Zhao and is unable to take it by direct assault or successive siege methods. The eventual capture comes only after intelligence reveals Hao Zhao’s grave illness and Kong Ming uses a concealed, accelerated move to exploit the defenders’ weakened position. The fall of the city is followed by the seizure of San Pass, Wudu, and Yinping, extending the operation beyond Chencang itself.

Campaign Background

After Zhao Zilong’s death, Kong Ming petitions the second ruler to resume the war against the north in fulfillment of the mandate given to him by the first ruler. The ruler approves, and Kong Ming launches an army of three hundred thousand toward Chencang, with Wei Yan leading. The Wei court responds by sending Cao Zhen with one hundred and fifty thousand troops to protect the key passes; Wang Shuang commands the vanguard.

Chencang is not an open target. When the Shu army arrives, it finds the city stoutly fortified and under Hao Zhao’s command. The initial difficulty establishes the campaign’s central problem: numerical strength and a large expeditionary force do not by themselves overcome a prepared defensive position. The city’s walls and defenses force Kong Ming to search for a way in while the Wei relief force threatens the surrounding operation.

The Failed Negotiation

Jin Xiang, one of Kong Ming’s commanders and a friend of Hao Zhao, proposes approaching the defender to discuss surrender. His personal connection offers a way to avoid an expensive assault, but it does not persuade Hao Zhao. On Jin Xiang’s first visit, Hao Zhao refuses to negotiate and drives him away. On his second attempt, Jin Xiang cannot even enter the city; Hao Zhao takes aim at him from the wall, and he has to flee.

The two failed approaches reveal the limits of relying on acquaintance or negotiation against a commander resolved to hold his position. They also send the Shu army back to force. Kong Ming’s spies estimate that the city has only about three thousand defenders, and he orders a hundred siege towers, expecting that this relatively small garrison can be overcome quickly. The estimate, however, does not capture the decisive strength of the defense: Hao Zhao is ready for the methods the attackers use.

Assaults and Defensive Measures

Hao Zhao’s response defeats each of Kong Ming’s successive approaches. Flaming arrows destroy the siege towers and set fire to them, killing many of the men inside. Kong Ming then orders battering rams for a mass attack, but Hao Zhao uses huge rocks suspended on ropes to smash the rams aside. A tunnel dug beneath the walls fares no better: Hao Zhao orders a counter-tunnel, and the miners are killed. Each new assault is met with a defense tailored to the equipment and method employed, so the Shu army’s investment in siege works produces no immediate breach.

The stalemate becomes more dangerous when news arrives that the Wei vanguard, led by Wang Shuang, is approaching. Kong Ming sends troops to meet it. Wang Shuang kills a Shu commander, and the resulting panic drives Shu troops into retreat. The defeat weakens morale, prompts desertions, and leaves Kong Ming in serious difficulty while Chencang remains uncaptured. The campaign now faces two pressures at once: the city’s defenses and the possibility that relief forces will further imperil the besiegers.

Intelligence and the Capture

The balance changes when Kong Ming learns through spies that Hao Zhao is seriously ill. He immediately dispatches Wei Yan and Jiang Wei to attack Chencang, but tells them to begin only when they see flames rising inside the city. He gives them three days to prepare and leave, a timetable that appears to place the assault in the future. Meanwhile, he gives Zhang Bao and Guan Xing secret instructions and sets out with them himself.

When Wei Yan and Jiang Wei reach the city, they discover that Kong Ming has already captured it. The three-day delay was cover: Kong Ming had gone ahead at once, taking advantage of the defenders’ demoralization in the wake of Hao Zhao’s illness. Pro-Shu supporters inside the city set fire to the gates, helping bring about the fall. The defenders offer little resistance in the ensuing fighting, and Hao Zhao dies on his sickbed, knowing that the city has fallen and further resistance is futile. The sequence turns intelligence into operational advantage: the illness creates an opening, the secret movement exploits it, and support inside the city helps make the capture possible.

Territorial Consequences

Kong Ming does not stop at the city. After Chencang falls, his army captures San Pass, blocking Wei reinforcements from reaching the area. From the plains beyond the Qishan hills, he sends Jiang Wei to take Wudu and Wang Ping to seize Yinping. The operation therefore expands from a siege into a campaign to control the routes and neighboring territories that could shape the next phase of the war.

The news of Chencang’s fall reaches Cao Rui together with reports of Hao Zhao’s death, Kong Ming’s movement through the Qishan hills, and Sun Quan’s declaration of himself as emperor. Cao Rui is distressed and summons Sima Yi for advice. Sima Yi judges that the immediate danger is from Shu rather than Wu, reasoning that the Wu campaign may be a feint linked to its alliance with Shu and that Lu Xun will wait to see how the conflict develops. Cao Rui promotes Sima Yi and offers him the imperial seal of authority then held by Cao Zhen; Sima Yi replies that he will obtain it himself. Chencang’s capture thus prompts a wider reassessment at the Wei court, while the seizure of the pass and neighboring commanderies gives the Shu victory strategic consequences beyond the city walls.