2 Kings 3:20-24

The next morning, about the time of offering the sacrifice, behold, water came from the direction of Edom, till the country was filled with water. 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 border. And when they rose early in the morning and the sun shone on the water, the Moabites saw the water opposite them as red as blood. And they said, “This is blood; the kings have surely fought together and struck one another down. Now then, Moab, to the spoil!” But when they came to the camp of Israel, the Israelites rose and struck the Moabites, till they fled before them. And they went forward, striking the Moabites as they went.