Jiang Gan’s Fake Letter Stratagem

Jiang Gan’s Fake Letter Stratagem is Zhou Yu’s counterstroke against an attempted political approach: by allowing Jiang Gan to carry a fabricated letter back to Cao Cao, Zhou Yu provokes Cao Cao into executing Cai Mao and Zhang Yun, the commanders whose knowledge of naval warfare made them valuable to him. The episode turns a failed effort to recruit Zhou Yu into a success for Zhou Yu, and shows how staged appearances and an eager audience can make forged evidence more destructive than an open attack.

The Visit as a Display

Jiang Gan goes to see Zhou Yu intending to persuade his old friend to change sides. Zhou Yu answers the visit with a carefully managed performance. He hosts a large party and orders the military commanders to attend, making the size and readiness of his forces plain to his guest. He also invites Jiang Gan to stay the night. The hospitality is part of Zhou Yu’s plan: Jiang Gan is not simply received; he is given a view of the strength Zhou wants him to report.

As the two old friends drink together, Zhou Yu grows increasingly eccentric in appearance, seeming so drunk that he can barely understand what is happening. The display helps set up what follows. Jiang Gan has seen enough to conclude that he has no prospect of persuading Zhou Yu to defect, but Zhou Yu’s apparent loss of control makes the tent seem briefly accessible to him.

The Letter and Its Theft

Near the end of the evening, Zhou Yu invites Jiang Gan to sleep in his tent. He then pretends to be deeply asleep, snoring as if unaware of his surroundings. Jiang Gan takes the opportunity to look through the tent and finds a letter that appears to be from Cai Mao and Zhang Yun. It claims that they were forced to serve Cao Cao but have used deceit to get close enough to kill him, and that they intend to deliver Cao Cao’s head to Zhou Yu.

The letter is fabricated, but Jiang Gan treats it as an opportunity. He understands that he will not return with the achievement he was sent to secure: Zhou Yu will not change sides. By stealing the apparent evidence of betrayal, however, Jiang Gan believes he can still win Cao Cao’s approval. The stratagem therefore depends on two different misreadings. Jiang Gan mistakes the planted document for a useful discovery, while Zhou Yu anticipates that Cao Cao may accept its alarming claims without testing them.

After a night spent anxiously fearing Zhou Yu will wake or notice the theft, Jiang Gan slips away early in the morning. His escape completes the apparent secrecy of the discovery and allows the letter to arrive at Cao Cao’s camp as a private revelation rather than as an accusation openly delivered by Zhou Yu.

Cao Cao’s Decision and the Strategic Cost

Jiang Gan goes directly to Cao Cao and admits that Zhou Yu will not be persuaded to change sides. Cao Cao responds with anger. Jiang Gan then claims to have found something more important, but says he can disclose it only in private. Once the room is cleared, he presents the letter. The setting lends the document an air of confidential proof, and Cao Cao orders Cai Mao and Zhang Yun executed immediately.

Only when their heads are brought in does Cao Cao understand that he has been deceived. He cannot bear the humiliation of acknowledging the mistake and refuses to admit that the letter fooled him. The decision has already taken effect: the two commanders who understood marine warfare are dead, and Cao Cao’s other commanders are appalled. Zhou Yu, hearing what happened, is relieved because those two men had worried him most. His relief is accompanied by anxiety about whether Kong Ming has worked out the deception, leaving the victory secure in its immediate result but still entangled with the larger contest of strategy.

Deception, Credibility, and Consequence

The stratagem succeeds not through the letter alone but through the chain of choices that gives it force. Zhou Yu stages his apparent drunkenness and sleep; Jiang Gan steals and carries away the document; Cao Cao interprets its contents as grounds for immediate action; and the truth becomes undeniable only after the executions. Each participant acts on an appearance that serves a different purpose, but Cao Cao’s refusal to acknowledge the error prevents correction once the evidence arrives.

The outcome is a sharp contrast between the two camps’ strategic positions. Zhou Yu’s staged hospitality conceals a calculated operation, while Cao Cao’s response turns suspicion into an irreversible loss of naval expertise. The forged letter is thus more than a trick played on a visitor: it converts Jiang Gan’s failed diplomatic mission into a damaging decision inside Cao Cao’s own command, and leaves Zhou Yu free of the two opponents he feared most.