负黍 / Fushu

负黍 / Fushu appears in 《资治通鉴·周纪》07丨两起刺杀（2） as a city that repeatedly changes hands among 韩国, 郑国, and 楚国. The episode says it was originally a Han city, was seized by Zheng in 407 BCE, defected back to Han in 394 BCE, and was soon taken from Han by Chu.

The page anchors Territorial Control Churn / 城池反复易手. Fushu is not treated as important only because of its own size; it is a compact example of how border cities, defections, and fast follow-on campaigns make the early 战国时期 feel less stable than the older aristocratic order.

Connections

• 韩国, 郑国, and 楚国 - states in the source’s control sequence.
• Territorial Control Churn / 城池反复易手 - main concept illustrated by the city.
• Small-State Buffer Diplomacy / 小国夹缝外交 - adjacent Zheng pressure frame.
• 战国时期 - period setting.