传硕公版书
回兵第二百一十
回兵，建五方旗，依色配方位。中央土位不动，故大将军以黄旗为四旗之主，常使诸军准望，知大将军所在处回兵。南方有贼，大将军举赤旗以应之；东方有贼，举青旗应之；西方有贼，举白旗应之；北方有贼，则举黑旗应之。无贼常偃之。举旗者令诸军知贼所来也，旗却偃即回。
虎钤经 · 许洞 · Chapter 218 of 218
回兵第二百一十
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