Judges 3:2 in the World English Bible
only that the generations of the children of Israel might know, to teach them war, at least those who knew nothing of it before:
Context
1 Now these are the nations which the LORD left, to prove Israel by them, even as many of Israel as had not known all the wars of Canaan;
2 Only that the generations of the children of Israel might know, to teach them war, at the least such as before knew nothing thereof;
3 Namely, five lords of the Philistines, and all the Canaanites, and the Sidonians, and the Hivites that dwelt in mount Lebanon, from mount Baal-hermon unto the entering in of Hamath.