Heaven-Scraping Mountain is the formidable barrier Deng Ai crosses in his attempt to reach Chengdu by an unexpected route. Its sheer slopes make an ordinary passage appear impossible, but a twenty-day effort to climb and prepare a way for supplies allows Deng Ai’s men to traverse the range and descend into Shu territory. The crossing enables the capture of Jiangyou and brings the defence of Shu’s capital into immediate danger; a stele bearing a prediction attributed to Kong Ming gives the episode a second significance, making the mountain a place where strategic surprise meets the story’s language of foreknowledge.

A Barrier and a Strategic Choice

The crossing grows out of rivalry within the Wei command. After Zhong Hui takes Hanzhong, Deng Ai decides that he can advance on Chengdu and claim the distinction of victory for himself. He sets out the next day, while Zhong Hui dismisses the undertaking as impossible and expects Deng Ai to perish on the way. The route over Heaven-Scraping Mountain is thus not simply a difficult stretch of terrain: it is Deng Ai’s bid to turn an apparently prohibitive barrier into an advantage over both Shu and his rival commander.

The practical obstacle is severe. Deng Ai and his men spend twenty days climbing and making a road that will allow supplies to follow. At the foot of the mountain, the engineers lose hope because the slopes are rugged and sheer, and they see no way to construct a path across them. Deng Ai refuses to turn back, pointing to the distance already covered—more than four hundred miles—and asks his men to undertake the challenge. Their agreement commits the force to a route with no easy retreat.

The Ascent and Descent

The army climbs the almost sheer face and reaches the summit, with the way forward far below on the other side. Deng Ai orders the soldiers to send their weapons down the cliff first. He then wraps himself in a felt jacket and rolls down; his men follow in the same manner. Those without felt use ropes, holding to trees and bushes as they descend. The passage depends on improvisation and collective risk rather than a constructed road over the summit: the preparations make it possible for supplies to follow, but the actual descent is carried out by men negotiating the steep terrain directly.

At the foot of the far slope, the soldiers find a stele engraved with words attributed to Kong Ming. Its lines predict that fires will begin, a man will pass, and death will soon follow. Deng Ai is astonished by the apparent foreknowledge and venerates the stele. The episode therefore presents the mountain crossing twice over: as a military feat achieved through determination and adaptation, and as an event seemingly anticipated by a message left by a strategist who is no longer directing the campaign.

From the Mountain to Jiangyou

The descent gives Deng Ai’s force the element of surprise. His men reach Shu territory by a route that Zhong Hui had considered impossible, and they take Jiangyou with ease. The rapid advance carries the consequences of the crossing beyond the mountain itself: news reaches the ruler of Shu, who is alarmed, but Huang Hao tells him that the reports are false. The delay in responding leaves the threat advancing while the court initially discounts it.

The mountain is consequently a turning point in the campaign’s geography. By overcoming a natural obstacle that seemed to rule out an attack, Deng Ai changes the available approach to Chengdu and forces Shu to confront a danger from an unexpected direction. The account does not make the crossing the sole cause of Shu’s eventual defeat, but it establishes the route by which Deng Ai’s surprise advance begins and shows how terrain, preparation, and disbelief at court combine to shape what follows.

Prophecy and Narrative Meaning

The stele gives the crossing a prophetic frame. Its short prediction is linked to the route Deng Ai has just taken and to the deaths anticipated in its final line; the accompanying verse emphasizes the mountain’s steepness, the difficulty of the passage, Deng Ai’s felt-wrapped descent, and his astonishment that Kong Ming had foreseen it. The text thus turns a practical exploit into an apparent fulfilment of an earlier warning, without displacing the concrete means by which the army makes its way down.

Heaven-Scraping Mountain stands at the meeting point of military geography and the novel’s interest in prediction. Its cliffs impose real limits on movement, but Deng Ai’s decision and his soldiers’ improvised descent overcome those limits. The stele then casts the successful passage as more than a feat of planning: it suggests that the moment was already legible in Kong Ming’s words, even as the campaign continues through human choices and their consequences.