Judges 2:10

2:10 That entire generation passed away; a new generation grew up that had not personally experienced the Lord’s presence or seen what he had done for Israel.

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 20:17

20:17 The men of Israel (not counting Benjamin) had mustered four hundred thousand sword-wielding soldiers, every one an experienced warrior.