“Now these are the nations that Yahweh left, to test all those in Israel who had no experience of any war in Canaan. It was only that successive generations of Israelites might know war, to teach those who had no experience of it before. The five lords of the Philistines, all the Canaanites, and the Sidonians, and the Hivites who lived on Mount Lebanon, from Mount Baal-hermon as far as the Lebo-hamath. They were for the testing of Israel, to know whether Israel would obey the commandments of Yahweh, which he commanded their ancestors by Moses. So the Israelites lived among the Canaanites, the Hittites, the Amorites, the Perizzites, the Hivites, and the Jebusites. They took their daughters as wives for themselves, and their own daughters they gave to their sons. They worshipped their gods.”
Once again we have the traditional enemies that came be found as far back as Genesis, the Canaanites, the Hittites, the Amorites, the Perizzites, the Hivites, and the Jebusites. The Israelites needed to learn about war and so they were tested. Yahweh let these 6 groups remain. However, 2 new groups were added, the Philistines and the Sidonians. The Israelites were not following Yahweh’s law because they intermarried with these other groups and worshipped their gods, a very serious transgression.