Judges 3:2

3:2 He left those nations simply because he wanted to teach the subsequent generations of Israelites, who had not experienced the earlier battles, how to conduct holy war.

Judges 6:2

6:2 The Midianites overwhelmed Israel. Because of Midian the Israelites made shelters for themselves in the hills, as well as caves and strongholds.

Judges 8:20

8:20 He ordered Jether his firstborn son, “Come on! Kill them!” But Jether was too afraid to draw his sword, because he was still young.

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.