2 Kings 3:20-27

20 The next day, about the time of the morning offering, suddenly water began to flow from the direction of Edom, until the country was filled with water.
21 When all the Moabites heard that the kings had come up to fight against them, all who were able to put on armor, from the youngest to the oldest, were called out and were drawn up at the frontier.
22 When they rose early in the morning, and the sun shone upon the water, the Moabites saw the water opposite them as red as blood.
23 They said, "This is blood; the kings must have fought together, and killed one another. Now then, Moab, to the spoil!"
24 But when they came to the camp of Israel, the Israelites rose up and attacked the Moabites, who fled before them; as they entered Moab they continued the attack.
25 The cities they overturned, and on every good piece of land everyone threw a stone, until it was covered; every spring of water they stopped up, and every good tree they felled. Only at Kir-hareseth did the stone walls remain, until the slingers surrounded and attacked it.
26 When the king of Moab saw that the battle was going against him, he took with him seven hundred swordsmen to break through, opposite the king of Edom; but they could not.
27 Then he took his firstborn son who was to succeed him, and offered him as a burnt offering on the wall. And great wrath came upon Israel, so they withdrew from him and returned to their own land.