Digging Ditches or Drying Up

Three kings came together to fight the Moabites, but the problem was that one was completely ungodly, and the other, Jehoshaphat, was a very Godly man. So they went in the name of the Lord, and when God commanded them to dig ditches, they did so, and when nothing seemed to come of it they worshipped God anyway, and God immediately gave them water.