Judges 20:38

20:38 The Israelites and the men hiding in ambush had arranged a signal. When the men hiding in ambush sent up a smoke signal from the city,

Judges 20:40

20:40 But when the signal, a pillar of smoke, began to rise up from the city, the Benjaminites turned around and saw the whole city going up in a cloud of smoke that rose high into the sky.