2 Samuel 8:1-4

1Now it came about after this that David defeated the Philistines and subdued (humbled) them, and he took control of Metheg-ammah [the main city] from the hand of the Philistines.

2He defeated Moab, and measured them with a length of rope, making them lie down on the ground; he measured two lengths to [choose those to] put to death, and one full length to [choose those to] be kept alive. And the [surviving] Moabites became servants to David, bringing tribute.

3Then David defeated Hadadezer the son of Rehob, king of Zobah, as he went to restore his power at the River [Euphrates].

4David captured from him 1,700 horsemen and 20,000 foot soldiers. David also hamstrung all the chariot horses (making them lame), but reserved enough of them for a hundred chariots.