Judges 20:36-37

³⁶And the children of Benjamin saw that they were smitten; and the men of Israel gave place to Benjamin, because they trusted in the ambuscade which they had prepared against Gabaa.

³⁷And when they retreated, then the liers in wait rose up, and they moved on toward Gabaa, and the whole ambush came forth, and they smote the city with the edge of the sword.