What does Judges 20:40 mean?
This is the moment when any confidence felt by Benjamin's army vanishes, quite literally with a puff of smoke. The Israelite soldiers who ambushed Gibeah (Judges 20:29) have conquered it and set it on fire (Judges 20:37–38). A thick column of smoke rises into the sky above the town. This is the signal for which the main body of the Israelite army has been waiting. At this notice, their false retreat—the reason for Benjamin's confidence (Judges 20:39)—will turn into an all-out counterattack. Benjamin's army will be pinned between the Israelites they have been chasing and those who have taken up positions behind them.The men of Benjamin turn and notice the smoke, as well. They instantly realize they have been duped. Their city is lost. The battle cannot be won, and they are doomed (Judges 20:41).