And David took from him a thousand chariots, and seven thousand horsemen, and twenty thousand footmen: David also hamstrung all the chariot horses, but reserved of them a hundred chariots.
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George Leo Haydock
Footmen. Hebrew may well signify, "1000 chariot-horses and 7000 men who mounted the chariots and the horses. "We only find 1700 horsemen, 2 Kings viii. 4. But soon after it is added, David houghed all the chariot-horses. (Calmet)
They were thus rendered useless. The king was forbidden to keep many horses. (Du Hamel)