Thy choicest valleys shall be full of chariots: valleys were the most proper places for the use of chariots: see Joshua 17:16. The horsemen shall set themselves in array at the gate, to assist and defend the footmen whilst they made their assault, and withal to prevent and take those who endeavoured to escape.
Related Commentaries of Isaiah 22:7
Isaiah 22:7
7 And it shall come to pass, that thy choicest valleys shall be full of chariots, and the horsemen shall set themselves in array at the gate.