What is "mi'Kol Hamon"?
Rashi: The great noise that comes in front of You.
Radak #1: If the verse discusses Machaneh Ashur, this is the voice of the angel that strikes them.
Radak #2: If it discusses Gog and Magog, it is like it says "va'Yetzei Hashem v'Nilcham ba'Goyim ha'Hem" (Mal'achi 3:15-16).
Malbim: The cacophony of the people in Sancheriv's camp.
What moved the nations?
Rashi: You did wondrous miracles for us.
Radak: This refers to those who survived from Sancheriv's camp.
Malbim: Sancheriv displaced them.
What do we learn from "me'Romemusecha"?
Radak: From your exaltedness. They will know that You were elevated over them, and their Gevurah and multitudes will not help.
Malbim: If Sancheriv displaced nations, all the more so Hashem will scatter Goyim, i.e. Sancheriv's camp.
