2 Chronicles 20:22-24

22The moment they began their shouts and praises, the Lord set an ambush against the Ammonites, Moabites, and the inhabitants of Mount Seir who came to fight against Judah, and they were defeated.

23The Ammonites and Moabites turned against the inhabitants of Mount Seir and completely annihilated them. When they had finished with the inhabitants of Seir, they helped destroy each other.

24When Judah came to a place overlooking the wilderness, they looked for the large army, but there were only corpses lying on the ground; nobody had escaped.