Changcheng is a Wei-held city where supplies for the campaign are stored, and its position makes it a strategic target during Jiang Wei’s invasion. The siege brings Shu close to taking the city, but reinforcements and shifting political fortunes turn the apparent opportunity into another abandoned campaign.

Strategic Setting

In the account of the Three Kingdoms, control of territory and the ability to sustain armies shape the conflict among Liu Bei, Cao Cao, and Sun Quan. Changcheng’s stated importance is practical: Wei stores supplies there, making the city a valuable objective for an invading force. The evidence identifies it as a city under the command of Sima Wang, a cousin of Sima Zhao, rather than describing its physical layout or its wider history.

Jiang Wei’s Attack

In AD 258, Jiang Wei invades Wei, seeking to exploit the disorder caused by Zhuge Dan’s revolt. He first overcomes Sima Wang in the field. Sima Wang retreats into Changcheng, and Jiang Wei’s forces besiege him there. The attack advances to the point where Shu’s troops are about to overwhelm the city walls and seize the city, bringing the campaign close to a decisive success.

Relief and Abandoned Opportunity

The siege is broken when the Wei general Deng Ai arrives with reinforcements. The account describes the result as a stalemate: neither the near-assault nor the relief force immediately settles control of the city. The decisive change comes with news from elsewhere. Jiang Wei learns that Zhuge Dan has died, his revolt has failed, and Wu’s troops have surrendered. With the rebellion that had created the opening now defeated, Jiang Wei concludes that the campaign cannot continue and withdraws his army.

Narrative Significance

Changcheng’s episode shows how a military objective can depend on events far beyond its walls. The city’s stores make it worth attacking, and Shu comes close to capturing it, but the larger political crisis that prompted the invasion collapses before that local success can be secured. Jiang Wei’s retreat turns the siege from a prospective victory into another unrealized hope.