The burden of Babylon, which Isaiah the son of Amoz did see. Lift ye up a banner upon the high mountain, exalt the voice unto them, shake the hand, that they may go into the gates of the nobles. I have commanded my sanctified ones, I have also called my mighty ones for mine anger, even them that rejoice in my highness. The noise of a multitude in the mountains, like as of a great people; a tumultuous noise of the kingdoms of nations gathered together: the LORD of hosts mustereth the host of the battle. They come from a far country, from the end of heaven, even the LORD, and the weapons of his indignation, to destroy the whole land.
The next eleven chapters contain prophecies against Gentile nations. The first is Babylon, the world power that crushed Assyria. In Chapter 13, we see Babylon being conquered by the Medes and Persians. However, some of the prophecies look beyond that event to the final destruction of Babylon at the close of the Great Tribulation. God musters the Medo-Persian army to enter the gates of the city of Babylon and to destroy the whole land.