40 But when the column of smoke began to rise from the city, the Benjamites turned and saw the whole city going up in smoke.

Read Judges 20:40 Using Other Translations

But when the flame began to arise up out of the city with a pillar of smoke, the Benjamites looked behind them, and, behold, the flame of the city ascended up to heaven.
But when the signal began to rise out of the city in a column of smoke, the Benjaminites looked behind them, and behold, the whole of the city went up in smoke to heaven.
But when the warriors of Benjamin looked behind them and saw the smoke rising into the sky from every part of the town,