The reversal for the king of Babylon, or Assyria, continues. When the final judgment comes, there will be a complete reversal of fortunes. Not only will the great nations be destroyed, but the children as well. That is not to be taken literally, but in the sense that there will be none to raise those nations again. Their destruction will be final.
Jehovah will, in the last days, rise up against the nations of the earth, here represented by Babylon. Just as Babylon (or Assyria) was a tool for Jehovah which swept the land of Israel, so in the end will the reversal be complete and they will be swept with the broom of destruction.
The Lord declares “surely as I have thought, so shall it come to pass.” The power of the Lord is that his thoughts become enacted. This image at least invokes the creation, where Jehovah spoke, and it was done.