Judges 20:39 in the King James Version
And 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.
Context
38 Now the appointed sign between the men of Israel and the ambushers was that they should make a great cloud of smoke rise up out of the city.
39 The men of Israel turned in the battle, and Benjamin began to strike and kill of the men of Israel about thirty persons; for they said, “Surely they are struck down before us, as in the first battle.”
40 But 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 city went up in smoke to the sky.