II Kings 3:20-24

Now it happened in the morning, when the grain offering was offered, that suddenly water came by way of Edom, and the land was filled with water. And when all the Moabites heard that the kings had come up to fight against them, all who were able to bear arms and older were gathered; and they stood at the border. Then they rose up early in the morning, and the sun was shining on the water; and the Moabites saw the water on the other side as red as blood. And they said, “This is blood; the kings have surely struck swords and have killed one another; now therefore, Moab, to the spoil!” So when they came to the camp of Israel, Israel rose up and attacked the Moabites, so that they fled before them; and they entered their land, killing the Moabites.