Longxi

Longxi is presented as a strategically important grain-producing region in the northwestern frontier wars. During Kong Ming’s 231 campaign against Wei, control of its fields determines whether the Shu army can maintain its supplies; the contest for the region turns on reconnaissance, deception, and the ability to protect the harvest.

Strategic Setting

Sima Yi anticipates that Kong Ming will need grain and expects him to force the Qishan pass to reach Longxi’s fields. Kong Ming takes Lucheng, near the fields, then advances toward Longshang, where Sima Yi has already positioned himself. The region’s importance is therefore practical as well as territorial: the army that controls the fields can feed its troops, while denying them to its opponent.

The Carriage Deception

Kong Ming answers Sima Yi’s position with a carefully staged ruse. He has three replicas made of his distinctive carriage and places lifelike dummies inside them. Each is accompanied by twenty-four barefoot men dressed in black; Kong Ming’s own carriage follows the same arrangement, with Guan Xing dressed as a local deity. The procession draws two thousand Wei soldiers away as they pursue it, giving Kong Ming room to act near the grain fields.

Sima Yi interprets the spectacle as an occult stratagem and retreats, but repeatedly encounters what appears to be Kong Ming and his carriage ahead of him. The deception unsettles the Wei army and sends it back toward Shanggui. Only afterward does Sima Yi learn that Jiang Wei, Ma Dai, and Wei Yan had been in charge of the other carriages: the apparent repeated appearances of Kong Ming were a coordinated military trick, not the presence of several identical commanders.

Harvest and Aftermath

With Sima Yi’s forces diverted, Kong Ming has the fields to himself, and thirty thousand Shu soldiers reap the harvest. The grain gives the campaign an immediate logistical gain. When Sima Yi and Guo Huai later try to attack Kong Ming while the troops thresh the crop, Kong Ming anticipates them: ambushes and a vigorous defense of Lucheng trap the Wei forces between two Shu formations and defeat them.

Sima Yi then attempts to sever the Shu supply line and wait for the army to consume its grain. Kong Ming instead attacks the weary Wei troops before they can establish camp, driving them from the passes and securing the route. Longxi thus marks a campaign in which control of food, roads, and the approaches to the fields is inseparable from battlefield success; Kong Ming’s deception buys the time and space needed for the harvest that sustains his army.