The Battle of Mayi (Chinese: 馬邑之戰), also known as the Scheme of Mayi (馬邑之謀) or the Encirclement at Mayi (馬邑之圍), was an aborted ambush operation by the Han dynasty against the invading Xiongnu forces led by Junchen Chanyu, with minimal casualties from both sides. Although no fighting took place, it marked the end of de jure peace between the Han dynasty and the Xiongnu, and led to the beginning of the subsequent Han–Xiongnu Wars. The failure of the operation also motivated the Han court to develop effective cavalry forces and the use of proactive expeditionary military policies.
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