Judges 20:36-40

So the sons of Benjamin saw that they were defeated. When the men of Israel gave ground to Benjamin because they relied on the men in ambush whom they had set against Gibeah,

the men in ambush hurried and rushed against Gibeah; the men in ambush also deployed and struck all the city with the edge of the sword.

Now the agreed sign between the men of Israel and the men in ambush was that they would make a great cloud of smoke rise from the city.

Then the men of Israel turned in the battle, and Benjamin began to strike and kill about thirty men of Israel, for they said, “Undoubtedly they are defeated before us, as in the first battle.”

But when the cloud began to rise from the city in a column of smoke, Benjamin looked behind them; and behold, the entire city was going up in smoke to heaven.