Judges 3:13

3:13 Eglon formed alliances with the Ammonites and Amalekites. He came and defeated Israel, and they seized the City of Date Palm Trees.

Judges 15:8

15:8 He struck them down and defeated them. Then he went down and lived for a time in the cave in the cliff of Etam.

Judges 20:36

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.