3:16-23
Elisha tells them that the Lord will “fill this valley with pools of water”. This would be a supernatural eve, God would also deliver Moab into their hands. The next morning the water came. The Moabites looked down and saw the water glistening, they thought it was blood and that Israel was in big trouble. So they set out to attack them.
3:24-27
The Moabites came to the camp, but the Israelites rose up and attacked them. They invaded the land and slaughtered the Israelites. The king of Moab tried to turn the course of the battle, but failed. He even sacrificed his son in a vain attempt to get the aid of his god. Unsurprisingly this did not work either. Godless people will do stupid things.