What is the comparison to a cloud?
Malbim: You came like a cloud, to take their land and rule over them. Rome's purpose was to rule over Yisrael and expand their kingdom.
What do we learn from "b'Acharis ha'Yamim Tihyeh"?
Malbim: You will [still] exist then.
Malbim (17): In the end of days, people will know that you are Gog.
What do we learn from "Lema'an Da'as ha'Goyim Osi?"?
Malbim: "I will bring you to My land", not to destroy it, rather, "so Goyim will know Me when I am sanctified through you in front of their eyes." Via the wonders that I will do to you, all will recognize My Elokus, how I judge nations and chastise sinners.
Why does it say "l'Eineihem Gog"?
Radak: "Gog" calls out to him.