Deut 7:1-2
7:1 When GOD, your God, brings you into the country that you are about to enter and take over, he will clear out the superpowers that were there before you: the Hittite, the Girgashite, the Amorite, the Canaanite, the Perizzite, the Hivite, and the Jebusite. Those seven nations are all bigger and stronger than you are. 2 GOD, your God, will turn them over to you and you will conquer them.

This was a HUGE PROMISE but they never remembered it.