Counterintelligence Rumor Wedge / 反间流言楔入

Counterintelligence rumor wedge / 反间流言楔入 is the tactic 《资治通鉴·周纪》78丨齐国命运竟被城管给救了？ gives to 田单 after 燕惠王 succeeds 燕昭王. Tian Dan sends agents to spread the idea that 乐毅 is delaying the fall of 即墨 because he wants to rule Qi for himself.

The mechanism is narrower than generic rumor erosion of trust. A rumor wedge works by finding an existing crack, here the crown-prince-era tension between Yan Huiwang and Le Yi, then inserting a story that makes a useful commander look more dangerous than useful.

Its success depends on timing. The same slander fails under Yan Zhaowang because the old ruler chooses public trust and punishes the slanderer. It works under Yan Huiwang because the successor inherits the army’s gains but not the old ruler-commander bond.

《资治通鉴·周纪》79丨史上用耕牛 打胜仗第一人 extends Tian Dan’s use of rumor after the commander replacement. He plants fears about mutilated prisoners and grave desecration so 骑劫 will act on them. This turns rumor from a ruler-commander wedge into a battlefield bait that creates atrocity backfire mobilization.

《资治通鉴·周纪》94丨杀神白起，长平之战中的“草包”名将？（1） adds a Qin version before 长平之战. 范雎 sends agents with heavy money into 赵国 to spread the claim that 秦国 does not fear 廉颇, that Lian Po may surrender, and that Qin truly fears 赵括. The wedge works because 赵丹 / 赵孝成王 is already dissatisfied with Lian Po’s defensive posture.

Key Claims

• Rumor is strongest when it amplifies a suspicion the target already finds emotionally or politically plausible.
• A succession transition can make old military success look like new political threat.
• Counterintelligence can be operational without immediately winning a battle if it causes the enemy to damage its own command structure.
• The tactic links information war to battlefield commander replacement risk: the rumor matters because it changes who commands the army.
• The same operator can use rumor at multiple levels: first to change enemy command, then to provoke visible enemy acts that damage occupation legitimacy.
• Qin’s Changping use shows the tactic can praise an untested enemy candidate rather than only accuse the incumbent; the goal is still to make the target ruler damage his own command structure.

Connections

• 田单 - user of the tactic.
• 燕惠王 - target whose suspicion is exploited.
• 乐毅 - commander reframed as a would-be usurper.
• 燕昭王 - contrast case where the same slander pattern fails.
• 骑劫, 暴行反噬式动员, and 火牛阵夜袭 - Zhouji 79 rumor bait and later attack sequence.
• 谣言侵蚀信任, 靠山更替暴露风险, and 阵前换将风险 - adjacent mechanisms.
• 范雎, 廉颇, 赵括, 赵丹 / 赵孝成王, and 长平之战 - Zhouji 94 Qin rumor wedge against Zhao command.
• 纸上谈兵式统帅陷阱 - the praised replacement’s underlying competence problem.