Battle of Yanling
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The Battle of Yanling (鄢陵之戰) was fought in 575 BC between the armies of Chu and Jin at Yanling in ancient China during the Spring and Autumn Period. The Chu army was in poor condition. The Jin attacked the flanks of the Chu knowing that the best Chu troops were in the centre. This tactic resulted in a Jin victory.
Reference - Men-At-Arm / Ancient Chinese Armies