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伏兵云气第一百七十四
进兵之时，先于山川四面望其云气。浑浑圆长，赤气在其中者，或如赤杵在黑云中者，其下有伏兵。或气青黑色掩北斗者，敌将设伏兵以待我也。或两军相当，赤气在阵前后者，亦有伏兵随气所在之方。或云绞绞绵绵者，此以车骑为伏也。或云气耸然类山丘形者，此皆精猛之伏兵也。或云气成布席状者，此以步卒为伏也，所见之地急防之。
虎钤经 · 许洞 · Chapter 179 of 218
伏兵云气第一百七十四
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