Thematic Bible: Some of, left to prove israel

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; Only that the generations of the children of Israel might know to teach them war, at the least such as before knew nothing of it;) Namely, five lords of the Philistines, and all the Canaanites, and the Sidonians, and the Hivites that dwelt on mount Lebanon, from mount Baal-hermon to the entrance of Hamath.