Judges 20:38-40

38Now there was an appointed sign between the men of Israel and the ambush, that they should make a thick column of smoke rise up out of the city.

39And when the men of Israel turned back in the battle, Benjamin began to smite, slaying of the men of Israel about thirty men; for they said, Surely they are quite routed before us as in the first battle.

40And when the burning began to rise up out of the city as a pillar of smoke, Benjamin looked behind, and behold, the whole city ascended [in smoke] to the heavens.