Isaiah 22:6 - Matthew Poole's English Annotations on the Holy Bible

Elam; the Persians, who now, and for a long time after. were subject to the Assyrian and Chaldean emperors, and were employed by them in their Wars. Bare the quiver, being expert bow-men, 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 fought from chariots and horses. Kir; the Medes, so called by a synecdoche from Kir, an eminent city and region of Media, of which see 2 Kings 16:9 Amos 1:5. Uncovered; prepared it and themselves for the battle; for in times of peace arms were wrapt up and covered, to preserve them clean, and fit for use. The shield; their defensive and offensive weapons.