The Longzhong Plan was a strategic blueprint presented by Zhuge Liang in 207 AD after Liu Bei’s three visits to his thatched cottage.
This strategy not only accurately assessed the overall situation in the late Eastern Han Dynasty but also provided clear direction for the Liu Bei group, which had been wandering without a stable base. It became a crucial concept that contributed to the formation of the Three Kingdoms tripartite confrontation. Simultaneously, its inherent design flaws also sowed the seeds for the subsequent decline of Shu Han.
Three-Step Strategic Conception
Based on the prevailing situation, Zhuge Liang formulated a complete path for Liu Bei from gaining a foothold to contending for supremacy. The core can be summarized in three steps: “Secure Key Territories, Forge Alliances, and Aim for the Central Plain.” Each step was closely tied to the power disparities and geographical characteristics of the various factions.
Assessing the Situation and Defining Positions
Zhuge Liang began by pinpointing the core structure of the power dynamics: Cao Cao, having held the Emperor hostage to command the feudal lords and recently defeated Yuan Shao at the Battle of Guandu, commanded a massive army and was too powerful to contend with directly. Sun Quan, ruling Jiangdong for three generations, enjoyed popular support and the natural barrier of the Yangtze River; he could be allied with but not targeted. Conversely, Liu Biao in Jing Province and Liu Zhang in Yi Province were inept rulers. Despite holding strategically vital territories, they lacked the ability to secure them, presenting the perfect opportunity for Liu Bei.
Consolidating a Foundation by Seizing Jing and Yi Provinces
Jing Province, located in the heartland, utilizing its central position to influence all directions, was a strategically contested state for military operations, capable of threatening the Central Plain to the north and allying with Jiangdong to the east.
Yi Province was a fertile land with easily defensible rugged terrain, the very foundation from which Emperor Gaozu of Han Liu Bang built his empire.
Zhuge Liang advised Liu Bei to seize these two regions to establish a stable base, ending his reliance on others. He also proposed peacefully treating the various Rong tribes in the west and pacifying the Yi and Yue tribes in the south to stabilize the rear areas, and internally cultivating good governance to attract talent and strengthen their own power.
Awaiting the opportunity for a two-pronged northern expedition
This was the ultimate goal. Zhuge Liang planned to wait until “there was turmoil in the north,” meaning internal instability within Cao Wei, then launch a two-pronged Northern Expedition: one force from Jing Province attacking Wancheng and Luoyang, led by a top general, and another from Yi Province through Qinchuan, led personally by Liu Bei. This pincer movement was designed to defeat Cao Wei and restore the Han Dynasty.
Facilitating the Rise of Shu Han and the Tripartite Balance
The most significant value of the Longzhong Plan was providing a clear guide for the lost Liu Bei group, directly leading to the establishment of Shu Han and the formation of the Three Kingdoms tripartite situation.
Guided by this strategy, Liu Bei allied with Sun Quan to win the Battle of Red Cliffs, halting Cao Cao’s southern advance, and subsequently seized parts of Jing Province.
Then, entering Yi Province and defeating Liu Zhang, they fully achieved the strategic goal of occupying both Jing and Yi provinces.
Subsequently, Liu Bei proclaimed himself King of Hanzhong, formally establishing the Shu Han regime, creating the tripartite balance with Cao Wei and Eastern Wu.
Furthermore, the core principle of allying with Wu to resist Cao became Shu Han’s long-term diplomatic cornerstone, repeatedly helping it counter Cao Wei’s pressure and buying crucial time for consolidating power.
Inherent contradictions and eventual decline
Although the Longzhong Plan demonstrated Zhuge Liang’s exceptional strategic vision, inherent contradictions within its design, limited by contemporary conditions and changing circumstances, ultimately led to implementation difficulties and contributed significantly to Shu Han’s decline.
The Fundamental Contradiction: Holding Jingzhou vs. Allying with Wu State
Jing Province was equally vital for Eastern Wu’s strategic security and westward expansion. Zhuge Liang’s plan for Liu Bei to hold Jing Province while maintaining a stable alliance with Sun Quan inherently contradicted Wu’s core interests.
This contradiction eventually erupted when Lü Meng secretly crossed the river and captured Jing Province, leading to Guan Yu’s defeat and death. This not only cost Shu Han a crucial strategic territory but also shattered the Shu-Wu alliance, triggering the disastrous Battle of Xiaoting.
Dispersed forces and Coordination challenges
Jing and Yi Provinces were separated by vast distances and treacherous terrain, making communication and coordination extremely difficult.
The plan required garrisoning troops in both regions and launching simultaneous Northern Expeditions, demanding exceptionally high coordination.
In reality, forces from Yi Province couldn’t quickly reinforce Jing Province. When Jing Province was attacked, the main Shu Han forces were often too far away to help. Guan Yu’s defense of Jing Province lacked support as the main army was busy consolidating Yi Province, leading to its fall. After losing Jing Province, Shu Han was confined to Yi Province, and Northern Expeditions could only be launched from Qinchuan, losing the possibility of the two-pronged attack.
Strategic Tilting: Prioritizing Yi over Jing
Although Zhuge Liang emphasized Jing Province’s importance, strategic deployment leaned towards Yi Province as the core base, leaving only a top general in Jing Province. This tendency led to Zhuge Liang, along with Zhang Fei and Zhao Yun, reinforcing Yi Province after Pang Tong’s death, leaving Guan Yu alone to defend Jing Province.
Guan Yu’s arrogance and insufficient forces ultimately led to the loss of Jing Province, shattering the Northern Expedition vision of the Longzhong Plan.
In summary, the Longzhong Plan was a model of ancient strategic planning, paving Liu Bei’s road to rise through its accurate situational analysis. However, its inherent strategic contradictions, combined with subsequent setbacks like the loss of Jing Province and the defeat at Xiaoting, ultimately prevented the full realization of this grand blueprint.
Nonetheless, it remains an iconic symbol of Zhuge Liang’s wisdom, profoundly influencing later understandings of Three Kingdoms history and strategic thought.
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