《资治通鉴·周纪》22丨公孙鞅诈魏公子卬

Summary

This 芮淇讲透资治通鉴 episode covers 340 BCE under 周显王, focusing on 公孙鞅 / 商鞅’s attack on 魏国 and his capture of 公子卬 / 公子昂. Shang Yang persuades 秦孝公 that Qin and Wei are strategic rivals, then personally leads the campaign because Qin’s 耕战逻辑 makes war the highest path to reward. The episode reads Gongzi Ang’s acceptance of a friendly peace parley as motivated bias and 和谈诱捕: he trusts old ties and a humane withdrawal proposal, but fails to ask why the invading Qin side would accept a no-gain retreat.

Key Claims

• In 340 BCE, the chronicle records three events: Shang Yang attacks Wei, Qi and Zhao jointly attack Wei, and 楚宣王 dies with 楚威王 succeeding him.
• The episode says 司马光 passes quickly over the Qi-Zhao and Chu succession notices but gives more space to Shang Yang’s attack on Wei.
• 公孙鞅 / 商鞅 tells 秦孝公 that 秦国 and Wei cannot remain harmless neighbors: if Wei is strong it threatens Qin, and if Qin attacks while Wei is weakened it can expand eastward.
• Shang Yang argues that Wei’s recent losses to 齐国 and loss of attached powers make this the right moment for Qin to strike.
• If Wei cannot hold its western territory and has to lean eastward, Qin can occupy the western advantage and build toward wider control over the lords.
• Shang Yang’s personal command is explained through 耕战逻辑: farming produces state strength but limited personal reward, while battlefield success can produce large rank and political capital under the 军功爵制.
• 魏惠王 sends 公子卬 / 公子昂 to face Shang Yang after Wei has already suffered heavy blows, including the earlier capture of 太子申 after 马陵之战.
• Shang Yang writes to Gongzi Ang as an old acquaintance, frames the war as public duty rather than private enmity, and proposes a meeting, alliance oath, drink, and mutual withdrawal.
• The episode says the proposal should have looked suspicious: Qin is the invader, so mutual withdrawal without territorial gain would mean Wei’s defense has succeeded and Qin has failed.
• Under Qin’s military-reward system, a voluntary empty-handed retreat would also disappoint the army and contradict Shang Yang’s own incentive logic.
• Gongzi Ang accepts because old friendship, peace rhetoric, and desire for a bloodless success fit what he wants to believe.
• During the post-oath drinking, Shang Yang’s hidden armed men seize Gongzi Ang, turning a peace ritual into battlefield deception.
• The episode frames the trap as a new reading of “兵以诈立” and closes by asking whether capturing the commander can become leverage for negotiation.

Key Quotes

“兵以诈立” - the episode’s frame for Shang Yang’s capture of Gongzi Ang.

“人容易相信自己愿意相信的事” - the psychological warning applied to Gongzi Ang’s acceptance of the parley.

“不战而屈人之兵” - the 《孙子兵法》 principle used as the next-episode hook.

Connections

• 芮淇讲透资治通鉴, 《资治通鉴》, 司马光, 周显王, and 战国时期 - show, base text, authorial selection, annalistic frame, and period setting.
• 公孙鞅 / 商鞅, 秦孝公, 秦国, 商鞅变法, 耕战逻辑, and 军功爵制 - Qin reform and incentive logic behind the campaign.
• 魏国, 魏惠王, 公子卬 / 公子昂, 太子申, and 马陵之战 - Wei side and its post-Maling vulnerability.
• Qin Eastward Pressure / 秦国东进压力, Early Warring States Interstate War / 战国早期诸侯混战, and Territorial Control Churn / 城池反复易手 - strategic map behind Qin’s attack.
• Peace-Parley Entrapment / 和谈诱捕, Motivated Bias / 动机偏差, and 减灶诱敌 - deception branch linking false peace, preferred belief, and earlier Maling false-signal tactics.
• 《孙子兵法》 - tactical principle invoked in the episode’s closing question about enlarging the result.

Contradictions

• No direct contradiction found. The source extends the existing 秦国东进压力 and 商鞅变法 branches by showing Qin’s reform incentives moving outward into a campaign against Wei.
• The raw markdown uses 公孙央 / 公孙鞅 and 公子昂 / 公子卬 forms; the wiki normalizes these to existing 公孙鞅 / 商鞅 and new 公子卬 / 公子昂 pages as name/transcription variants rather than separate people.