Why does it say "Anochi Me'ir"?
Malbim: It will be via Hashgachah.
What is the meaning of "v'Archu Lah"?
Rashi: They will arrange war against it.
Why does it say "mi'Sham Tilached"?
Radak: They will be trapped on the battlefield. The victor will not need to go to another place.
Malbim: The wall will be conquered (breached) from the north.
How are its arrows "k'Gibor Maskil"?
Radak: When he shoots them, they are not in vain; they kill. So will be the arrows of all who fight Bavel.
Malbim #1: It is as if they have intellect, and go by themselves to the target.
Malbim #2: There is a text "Mashkil". Based on this, they will be like a Gibor - when he finds no [soldier] to kill, he kills small children, and bereaves the father, lest the Gibor return empty.