“ And you went over Jordan, and came to Jericho, and the men of Jericho fought against you, the Amorite, and the Perizzite, and the Canaanite, and the Hittite, and the Girgashite, the Hivite and the Jebusite, and I delivered them into your hand.”
Here he reminded them of the miraculous, never to be forgotten, passage over Jordan, and the enemies they then faced, first ‘the lords of Jericho', then the seven Canaanite nations regularly mentioned. But none had been able to resist Israel because YHWH delivered them into their hand.