2 Samuel 8:1-4

In the course of time, David defeated the Philistines and subdued them, and he took Metheg Ammah from the control of the Philistines. David also defeated the Moabites. He made them lie down on the ground and measured them off with a length of cord. Every two lengths of them were put to death, and the third length was allowed to live. So the Moabites became subject to David and brought him tribute. Moreover, David defeated Hadadezer son of Rehob, king of Zobah, when he went to restore his monument at the Euphrates River. David captured a thousand of his chariots, seven thousand charioteers and twenty thousand foot soldiers. He hamstrung all but a hundred of the chariot horses.