2nd Kings 3:21

18 And this will be only a small thing to the Lord: in addition he will give the Moabites into your hands.

19 And you are to put every walled town to destruction, cutting down every good tree, and stopping up every water-spring, and making all the good land rough with stones.

20 Now in the morning, about the time when the offering was made, they saw water flowing from the direction of Edom till the country was full of water.

21 Now all Moab, hearing that the kings had come to make war against them, got together all who were able to take up arms and went forward to the edge of the country.

22 And early in the morning they got up, when the sun was shining on the water, and they saw the water facing them as red as blood.

23 Then they said, This is blood: it is clear that destruction has come on the kings; they have been fighting one another: now come, Moab, let us take their goods.

24 But when they came to the tents of Israel, the Israelites came out and made a violent attack on the Moabites, so that they went in flight before them; and they went forward still attacking them;