II Kings 3:24 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. 25 And they overthrew the cities, and on every good piece of land every man threw a stone until it was covered. They stopped every spring of water and felled all the good trees, till only its stones were left in Kir-hareseth, and the slingers surrounded and attacked it. 26 When the king of Moab saw that the battle was going against him, he took with him 700 swordsmen to break through, opposite the king of Edom, but they could not. 27 Then he took his oldest son who was to reign in his place and offered him for a burnt offering on the wall. And there came great wrath against Israel. And they withdrew from him and returned to their own land.
After Ahab died, the surrounding nations tested the waters to see if they could gain back some control. In particular, Moab rebelled against Israel and were intent on invading and plundering the land. Once again, Israel called on Judah for help, and a true prophet of God announced victory for Isreal. We get a glimpse of how twisted the thinking of the Moabites was, as the king of Moab offered his heir to the throne as a sacrifice, seeking victory from his gods. When we choose to go against God's will it is horrifying what we will do to resist it.