Judges 20:38

Now the sons of Israel had given a sign to those whom they had stationed in ambushes, so that, after they had seized the city, they would light a fire, and by the smoke ascending on high, they would show that the city was captured

Other versions

King James Version

Now there was an appointed sign between the men of Israel and the liers in wait, that they should make a great flame with smoke rise up out of the city.

English Standard Version

Now the appointed signal between the men of Israel and the men in the main ambush was that when they made a great cloud of smoke rise up out of the city

New International Version

The men of Israel had arranged with the ambush that they should send up a great cloud of smoke from the city,