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军事术语，进攻的一方以部分兵力包围守城之敌，诱使敌人派兵援救，然后以主力部队歼灭敌人的援军。
[besiege a city to annihilate the enemy relief force;besiege the enemy in order to strike at his reinforcements] 一种作战方略。一部兵力包围并佯攻敌城,另设伏兵攻打歼灭闻讯前来解围的城外援敌
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