Judges 20:36-39
20:36 Then the Benjaminites saw they were defeated.
The Israelites retreated before Benjamin, because they had confidence in the men they had hid in ambush outside Gibeah.
20:37 The men hiding in ambush made a mad dash to Gibeah. They attacked and put the sword to the entire city.
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,
20:39 the Israelites counterattacked. Benjamin had begun to strike down the Israelites; they struck down about thirty men. They said, “There’s no doubt about it! They are totally defeated as in the earlier battle.”