They come from a far country (comp. Isaiah 46:11). Both Media and Persia were "far countries" to the Hebrews, Persia especially. There is no indication that they knew of any countries more remote towards the East.
Hence the expression which follows, "from the end of heaven"—the heaven being supposed to end where the earth ended. Isaiah, like the other sacred writers, conforms his language on cosmical subjects to the opinions of his day.
Even the Lord. With a most effective anthropomorphism, Jehovah is made to march with the army that he has mustered (verse 4) against the land that has provoked his wrath—i.e. Babylonia. The weapons (comp.
Isaiah 10:15; Jeremiah 1:1-19 :25; Jeremiah 51:20). To destroy the whole land. Many critics would render ha-arets by "the earth" here. It may be granted that the language of the prophecy goes beyond the occasion in places, and passes from Babylon to that wicked world of which Babylon is a type; but, where the context permits, it seems better to restrict than to expand the meaning of the words employed.