Jiang Gan

Jiang Gan is an adviser to Cao Cao and an old school friend of Zhou Yu. His two visits to Zhou Yu during the confrontation between Cao Cao and the southern forces turn an attempted act of persuasion into a consequential channel for deception: first, Jiang carries a planted letter that helps bring about the execution of two commanders; later, his return gives Zhou an opportunity to continue manipulating Cao Cao’s suspicions. Jiang’s importance lies less in successful diplomacy than in how his confidence, embarrassment, and repeated access to Zhou become tools in another strategist’s contest.

Identity and Position

Jiang Gan serves among Cao Cao’s advisers. He claims an old friendship with Zhou Yu and believes that relationship may allow him to persuade Zhou to change sides. Cao Cao is surprised to learn that the two men know each other, but accepts Jiang’s offer to go to Zhou’s camp. The mission gives Jiang a personal and diplomatic role: he is to use familiarity where military pressure has not settled the contest.

First Visit and the Planted Letter

Zhou Yu receives Jiang with a deliberately grand display. He orders the military commanders to attend a party, making the scale and readiness of his forces plain to their visitor, and invites Jiang to stay overnight. The welcome does not mean Zhou is open to persuasion. It is a setting he controls, designed to show Jiang the strength of the southern army and to turn the visit to his own advantage.

Over the course of the evening, Jiang recognizes that he has little chance of winning Zhou over. Zhou, meanwhile, behaves as though drink has left him unaware of what is happening. When he appears to fall asleep, Jiang takes the opportunity to look through the tent and finds a letter apparently written by Cai Mao and Zhang Yun. It claims that, despite serving Cao Cao, the two commanders have used deception to place themselves where they can kill him and deliver his head to Zhou Yu. The letter is a fabrication planted as bait, but Jiang takes it for a valuable discovery.

Jiang steals the letter and slips away early, anxious that Zhou might wake or notice its absence. Back at Cao Cao’s camp, he admits that Zhou would not defect, then insists that he has found something more important and must reveal it privately. Once alone with Cao Cao, he presents the supposed proof of the commanders’ betrayal. Cao Cao orders Cai Mao and Zhang Yun executed. Only after their deaths does he realize that he has been deceived; although the other commanders are appalled, he cannot bear to acknowledge the mistake. Zhou, on hearing what happened, is relieved: the two men had been the commanders he feared most.

A Second Mission

Even after this disastrous outcome, Jiang is sent back to Zhou Yu’s camp. When Cao Cao doubts reports that appear to confirm Huang Gai’s planned defection, he decides to send a spy to test them. Jiang volunteers, still embarrassed by his first failure to bring Zhou over to Cao Cao’s side. His return is therefore driven by a desire to make up for that failure, but it also gives Zhou another opportunity to shape what reaches Cao Cao.

This time Zhou meets Jiang with apparent anger, blaming him for the earlier visit and the execution of Cai Mao and Zhang Yun. Zhou presents the theft of the letter as a disaster for his own plans and declares, through his treatment of Jiang, that their friendship is finished. Rather than keep him close, Zhou sends him to stay at a Western Hills monastery until Cao Cao has been defeated. The evidence establishes the renewed deception and its setting, but not the full outcome of Jiang’s second assignment.

Relationships and Narrative Role

Jiang’s old friendship with Zhou Yu is the premise of his first mission, but it gives him no genuine influence over Zhou’s decision. Zhou recognizes that Jiang cannot persuade him and instead makes their apparent intimacy part of a controlled performance: the party, the overnight stay, and the feigned drunkenness all help create the circumstances in which Jiang finds and steals the forged letter. Their friendship thus functions less as a bond of trust than as the opening through which Zhou directs a deception toward Cao Cao.

Jiang’s position with Cao Cao is also compromised by his first failure. He returns to Zhou’s camp ashamed that he did not secure a defection, and his eagerness to restore his standing makes him a willing participant in another intelligence mission. The first visit produces a concrete strategic consequence: Cao Cao loses two commanders who understand marine warfare, while Zhou removes the men he most feared. Jiang does not knowingly intend that result, but his confidence in the letter and his decision to carry it to Cao Cao make him the link between Zhou’s staged evidence and Cao Cao’s rash decision.

The episode presents Jiang as a go-between in a conflict where access and apparent friendship are not reliable guides to allegiance. His first mission fails on its stated terms, yet the failure yields a tactical advantage for Zhou Yu. The second mission repeats the pattern of Jiang’s return to Zhou’s presence, but the available account leaves its eventual result unresolved. No final change in Jiang’s allegiance or fate is established here.