1 Chronicles 20:3

And he brought out the people that were in it, and cut them with saws and with harrows of iron, threshing carts, and with axes, probably scythelike cutting instruments. The method of dealing with vanquished foes seems barbarous at this time, but was undoubtedly well deserved. Even so dealt David with all the cities of the children of Ammon, his purpose being a complete overthrow of these ancient enemies of Israel. And David and all the people returned to Jerusalem. What the Ammonites experienced has happened time and again in the course of history, namely, that people brought only misfortune upon themselves, especially in attempting to battle against the Lord and His Church.