Deng Ai

Deng Ai’s decisive role in the fall of Shu Han rests on a bold advance over Heaven-Scraping Mountain and a costly victory at Mianzhu. The narrative presents him as a commander who can turn terrain and surprise into strategic advantage, but whose triumph leaves him exposed to rivalry and political violence among the victorious Wei commanders.

Command and Military Strategy

During Jiang Wei’s renewed campaign against Wei, Deng Ai anticipates the Shu army’s arrival at Qishan. He prepares a concealed tunnel beneath its prospective camp and launches an attack from above and below. The assault fails to overwhelm Jiang Wei, and Deng Ai is driven back in the fighting that follows. This setback establishes him as a resourceful opponent, but also shows that careful preparation does not guarantee success against Jiang Wei’s methods.

Deng Ai later confronts Jiang Wei again alongside Sima Wang. Their conflict is described as a contest of stratagems and unusual military techniques as well as force. The Wei commanders are defeated, and Deng Ai is wounded by four arrows while retreating. Rather than continue relying on battlefield advantage, Deng Ai and Sima Wang seek to undermine Jiang Wei politically: they bribe Huang Hao and spread rumors that Jiang Wei intends to defect to Wei. The rumors persuade the Shu ruler to summon Jiang Wei back, disrupting his campaign through court intrigue.

Crossing Heaven-Scraping Mountain

During Wei’s invasion of Shu, Zhong Hui’s force advances while Deng Ai chooses a separate, more hazardous route toward Chengdu. After twenty days spent climbing and making a road for supplies, his engineers reach the foot of Heaven-Scraping Mountain and see no way to build a path across its sheer terrain. Deng Ai refuses to turn back after the army has already traveled more than four hundred miles.

Deng Ai asks his men to face the challenge with him, and they agree. At the summit, they send their weapons down the cliff before descending themselves: some roll down in felt jackets, while others use ropes and hold to trees and bushes. At the foot of the mountain, they find a stele bearing a prophecy written by Kong Ming. The perilous crossing gives Deng Ai’s force a route that bypasses the expected defenses and enables it to take Jiangyou by surprise.

Victory at Mianzhu

Deng Ai’s advance brings the Wei army into conflict with the forces defending Shu. Zhuge Zhan takes command at Chengdu, and Deng Ai suffers a series of setbacks before using a retreat-and-ambush strategy to inflict a crushing defeat. The Wei then besiege Mianzhu. Zhuge Zhan appeals to Wu for help, and Sun Xiu agrees to send reinforcements, but they cannot arrive in time to affect the immediate battle.

Zhuge Zhan, having lost hope of relief, makes a final attempt to break out with his son Zhuge Shang. Both die fighting, and Mianzhu falls the following day. Deng Ai is moved by the courage of father and son and gives them honorable burials. The victory opens the way for the march on Chengdu and marks the culmination of his daring route across the mountains.

Rivalry and Death

Deng Ai’s success sharpens his conflict with Zhong Hui. After Zhong Hui takes command and treats Zhuge Xu harshly, Deng Ai resents the authority Zhong Hui has assumed without consulting him. In their confrontation, each outwardly praises the other’s plans while privately dismissing them. Deng Ai decides that if Zhong Hui can take Hanzhong, he can capture Chengdu and claim the credit for victory; he sets out the next day, while Zhong Hui assumes the attempt is impossible.

The account later places Deng Ai’s death amid the disorder that follows Zhong Hui’s rebellion. After Zhong Hui and Jiang Wei are killed and Wei Guan restores order, Deng Ai and his son are released by their supporters. An officer who has his own reason to want them dead offers to take action. Deng Ai mistakes the approaching force for supporters and goes out to greet them without protection. He and his son are killed. His arc thus turns on the same independence that made his invasion possible: the audacious commander who rejects a seemingly impassable route succeeds against Shu, but cannot protect himself from the violent rivalries of the victorious side.