武关 / Wuguan

武关 / Wuguan appears in 《资治通鉴·周纪》51丨 楚怀王：秦小儿看舅舅如何灭了你！ as the pass route through which 楚怀王 tries to push against 秦国 after 张仪’s six-li reversal. The first attack moves north from Danyang toward Wuguan and ends in 丹阳之战.

The second attack uses the same route in a more dangerous way. Qin retreats through Wuguan and 商於, drawing the 楚国 army deeper toward Lantian, where the Chu force becomes isolated and supply-stretched before defeat at 蓝田之战. In this source, Wuguan is less a neutral place than a corridor where anger keeps pulling Chu into Qin’s chosen terrain.

《资治通鉴·周纪》53丨秦惠王用张仪换地皮 uses Wuguan in two ways. First, land east of Wuguan is part of 秦惠文王’s proposed exchange for 黔中. Second, after his release, 张仪 warns that Qin can exit Wuguan to cut off Chu’s northern territory, making the pass both a bargaining marker and a threat route.

《资治通鉴·周纪》62丨稷儿，诓你舅舅的“腿”啊 makes Wuguan the trap site itself. 秦昭襄王 invites 楚怀王 to meet there, but Qin has a general impersonate the king and closes the pass once Chu Huaiwang enters. In this source, Wuguan shifts from invasion corridor and bargaining marker into the place where Qin converts meeting protocol into captivity.

Connections

• 丹阳之战 and 蓝田之战 - two campaign stages tied to the route.
• 秦国, 楚国, and 楚怀王 - combatants and decision-maker.
• 商於 - promised region beyond the pass route.
• 因怒兴师 and 急行军作战风险 - decision and campaign-risk frame.
• 黔中, 张仪, and 连横 - Zhouji 53 land-exchange and Qin threat-map branch.
• 秦昭襄王, 昭雎, 芈兰, 咸阳, and 战术信用成本 - Zhouji 62 meeting trap and detention branch.