[1][2] In 557 BC, soon after Duke Ping ascended the throne, Jin fought its last major battle with its traditional enemy Chu at Zhanban (湛阪, in present-day Pingdingshan, Henan Province).
The Battle of Zhanban marked the end of the eight-decade-long Jin-Chu rivalry,[3] as a weakened Chu would be consumed by numerous wars with its new enemy Wu, culminating in the 506 BC Battle of Boju, when the Wu army would capture and destroy the Chu capital Ying.
[4] Meanwhile, Jin would increasingly be riven by internal strife that would ultimately lead to its partition into the new states of Han, Zhao, and Wei.
In 555 BC, Duke Ling of the State of Qi switched his alliance from Jin to its enemy Chu.
Aided by the Wei clan, Luan's forces captured the capital Jiang (綘), before being defeated by the Jin army.