Battle of Bi

The Battle of Bi or Pi (邲之戰) was fought in 595 BC, between the armies of Chu and Jin. The battle began when Jin chariots came out to rescue two of their skirmish units and the Chu charged them. The Chu began to advance on the Jin flanks, pushing back the Jin when 40 Chu chariots were committed into the battle. The Jin began to make a general withdraw. The battle ended with a Chu victory.

Reference

Osprey Men-At-Arm/ Ancient Chinese Armies