Judges 20:38-40

38Now there was an appointed sign between the men of Israel and the men in ambush, that they should make a great flame with smoke to ascend up from the city.123 39And when the men of Israel retired in the battle, Benjamin began to smite and kill of the men of Israel about thirty persons: for they said, Surely they are smitten down before us, as in the first battle.4 40But when the flame began to ascend up from the city with a pillar of smoke, the Benjamites looked behind them, and, behold, the flame of the city ascended up to heaven.5