Isaiah 22:6,7 - Joseph Benson’s Commentary on the Old and New Testaments

And Elam bare the quiver This second member of the first part of this prophecy, which begins here, seems evidently to refer to the Assyrian invasion; for the Medes and Elamites, or Persians, were united with the Assyrians in the time of Sennacherib, but not of Nebuchadnezzar. The Persians were expert bowmen, as appears from Jeremiah 49:35, and from Strabo's testimony. With chariots of men and horsemen As some of them fought on foot, so others from chariots and horses. And Kir That is, the Medes, so called, from an eminent city and region of that name in Media, 2 Kings 16:9; Amos 1:5; uncovered the shield Prepared their defensive and offensive weapons, and themselves, for the battle; for in times of peace arms were wrapped up and covered, to preserve them clean and fit for use. Thy choicest valleys shall be full of chariots Valleys were the most proper places for the use of chariots; and the horsemen at the gate To assist and defend the footmen, while they made the assault, and to prevent those who endeavoured to escape.