Was Lü Meng’s capture of Jing Province in AD 219 a betrayal of an ally? Some people argue that the Sun–Liu alliance effectively collapsed after the Xiang River Partition (circa AD 215), when Liu Bei and Sun Quan divided Jing Province along the Xiang River. However, primary sources from the Records of the Three Kingdoms (Sanguozhi) refute this view.
The Alliance was real – Not just in name
In the Biography of the First Ruler, it is clearly stated:
“He [Liu Bei] allied with Sun Quan.”
Similarly, the Biography of the Wu Sovereign records:
“They renewed their covenant of friendship.”
These are not diplomatic formalities – they reflect mutual recognition of an ongoing political and military alliance. In the context of Han-era interstate relations, formal acknowledgment was functionally equivalent to alliance, especially when both sides acted upon it.
Even if critics claim the alliance was “nominal,” that misses the point: in diplomacy, nominal alliances still carry expectations of non-aggression and mutual restraint – expectations Guan Yu reasonably relied upon.
Deception built on the foundation of trust
From the Xiang River agreement until the eve of the invasion in AD 219, the alliance remained operationally intact. The Biography of Lü Meng notes:
“Lü Meng sought to maintain friendly relations with Guan Yu.”
This “friendship” only makes strategic sense because they were allies. Had there been no alliance, such overtures would have appeared suspicious – “unsolicited kindness” often signals hidden intent. But Guan Yu interpreted these gestures within the framework of established trust, which is precisely why he felt secure enough to transfer rear garrisons to the Fancheng front.
Further proof lies in Lu Xun’s letter to Guan Yu, preserved in the Biography of Lu Xun:
“When an enemy state suffers defeat, the benefit accrues to our alliance.”
Though written as part of a psychological ruse, the letter openly refers to the two sides as “allies.” Sun Quan’s court publicly and repeatedly called Liu Bei’s regime an ally, even as they plotted its destruction. Guan Yu wasn’t merely flattered; he was strategically misled by institutional reality.
Thus, the operation (Lü Meng’s surprise attack on Jingzhou) – conceived by Sun Quan, planned by Lü Meng, and executed through Lu Xun’s deception – was not a response to war or provocation. It was a covert assault on a recognized partner, making it a textbook case of allied betrayal.
Covert War: “White Robes” and No Declaration
What distinguishes this episode is its clandestine execution. Chen Shou’s language in the Sanguozhi is telling:
“Sun Quan inwardly feared Guan Yu… He outwardly concealed his designs, while secretly assessing opportunities. He moved troops covertly and plotted in secret.”
The campaign culminated in the “White-Robed Crossing” – soldiers hidden in merchant vessels, rowers dressed as traders, slipping past defenses under nightfall. There was no declaration of war, no ultimatum, no severing of ties.
The raid on Pearl Harbor has been universally condemned for its deceit and lack of formal warning. Yet Sun Quan’s action was arguably more egregious: it combined non-declaration with the violation of an active alliance. This was not realpolitik alone – it was treachery disguised as diplomacy.
A legacy of distrust in Chinese history
If Sima Yi’s broken oath at the Luo River taught later generations that vows are unreliable, then Sun Quan’s betrayal of Jing Province delivered a darker lesson: allies may be the most dangerous foes.
In this sense, the “White-Robed Crossing” did more than shift territorial control – it cemented a culture of suspicion in Chinese statecraft. As Sima Guang later reflected in the Zizhi Tongjian, the fall of Guan Yu marked not just a military turning point, but a moral watershed, accelerating the descent into the ruthless pragmatism that defined the Three Kingdoms era.
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