Judges 20:36-39

³⁶So the soldiers of Benjamin saw they were defeated. The men of Israel had given ground to Benjamin, because they were counting on the men they had placed in hidden positions outside Gibeah.

³⁷Then the men who were hiding got up and hurried and they rushed into Gibeah, and they struck all the city with the edge of the sword.

³⁸The arranged signal between the soldiers of Israel and the men hiding in secret would be that a great cloud of smoke would rise up out of the city.

³⁹When the signal was sent the soldiers of Israel would turn from the battle. Now Benjamin began to attack and they killed about thirty men of Israel, and they said, “It is sure that they are defeated before us, as in the first battle.”