Adam Clarke on Micah 4:11

Many nations are gathered against thee - The Chaldeans, who were composed of many nations. And, we may add, all the surrounding nations were their enemies; and rejoiced when the Chaldean army had overthrown Jerusalem, destroyed the temple, and led the people away captive.

Let her be defiled - This was their cry and their wish: Let Jerusalem be laid as low as she can be, like a thing defiled and cast away with abhorrence; that their eyes might look upon Zion with scorn, contempt, and exultation.