Why Jiang Wei’s Eleven Failed Military Campaigns Ultimately Hastened the Fall of Shu Han
Between 240 and 262 CE, General Jiang Wei launched eleven ambitious military campaigns against the rival state of Cao Wei. Unlike his predecessor Zhuge Liang, Jiang Wei struggled with dwindling resources and mounting public resentment, ultimately draining Shu Han’s strength and leaving the state vulnerable to its eventual collapse in 263.
Following the death of the chancellor-regent Zhuge Liang in 234, Shu Han entered a period of relative peace under regents Jiang Wan and Fei Yi, who prioritized internal development over aggressive expansion. This changed in 240 when Jiang Wei, a prominent general, resumed attacks on Wei. While Zhuge Liang’s earlier campaigns had utilized massive armies of 60,000 to 100,000 troops, Jiang Wei’s forces were significantly smaller, rarely exceeding 30,000 soldiers. His strategy relied heavily on Hanzhong as a base, despite earlier warnings from his predecessors that the region's mountainous terrain created insurmountable logistical and supply challenges.
Jiang Wei’s campaigns were marked by a persistent, often unpopular, focus on inducing local tribes, such as the Qiang and Di, to join his cause. He prided himself on his understanding of these tribal customs, yet his attempts to coordinate attacks frequently faltered against the tactical acumen of Wei generals like Guo Huai and Deng Ai. These commanders repeatedly anticipated Jiang Wei’s movements, forcing him to retreat due to inadequate food supplies or battlefield defeats. Even when Jiang Wei achieved tactical successes, such as the 254 capture of three counties, the long-term cost to Shu’s limited resources proved unsustainable.
The campaigns became increasingly controversial within Shu. By 255, officials like Zhang Yi openly objected, warning that the state lacked the necessary resources and that the populace was exhausted by constant warfare. Despite such warnings and his own demotion following a disastrous defeat at Duan Valley in 256, Jiang Wei continued his incursions until 262. Popular culture, specifically the 14th-century novel Romance of the Three Kingdoms, erroneously labels these as the 'nine campaigns on the Central Plains,' but historical records confirm there were eleven distinct campaigns, none of which reached the Central Plains. These persistent, failed efforts ultimately depleted the state's vitality, directly preceding the fall of Shu in 263.
The strategic failure of these campaigns was often rooted in the inability to secure reliable supply lines through difficult terrain. Wei commanders, particularly Chen Tai and Deng Ai, mastered the art of defensive warfare, often choosing to wait out the Shu forces or lure them into traps rather than engaging in direct combat. This defensive superiority, combined with Shu’s internal political fractures and the assassination of the regent Fei Yi in 253—which granted Jiang Wei unchecked military authority—created a cycle of attrition that Shu Han could not survive.
Source: Jiang Wei's Northern Expeditions
