Judges 20:38-40

38Now the appointed sign between the men of Israel and the liers-in-wait was, that they should make a great cloud of smoke rise up out of the city. 39And the men of Israel turned in the battle, and 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. 40But when the cloud began to arise up out of the city in a pillar of smoke, the Benjamites looked behind them; and, behold, the whole of the city went up in smoke to heaven.