2 Kings 3:20-27

The next morning, about the time for offering the sacrifice, there it was—water flowing from the direction of Edom! And the land was filled with water. Now all the Moabites had heard that the kings had come to fight against them; so every man, young and old, who could bear arms was called up and stationed on the border. When they got up early in the morning, the sun was shining on the water. To the Moabites across the way, the water looked red—like blood. “That’s blood!” they said. “Those kings must have fought and slaughtered each other. Now to the plunder, Moab!” But when the Moabites came to the camp of Israel, the Israelites rose up and fought them until they fled. And the Israelites invaded the land and slaughtered the Moabites. They destroyed the towns, and each man threw a stone on every good field until it was covered. They stopped up all the springs and cut down every good tree. Only Kir Hareseth was left with its stones in place, but men armed with slings surrounded it and attacked it. When the king of Moab saw that the battle had gone against him, he took with him seven hundred swordsmen to break through to the king of Edom, but they failed. Then he took his firstborn son, who was to succeed him as king, and offered him as a sacrifice on the city wall. The fury against Israel was great; they withdrew and returned to their own land.