Without the walls - These words are to be joined to wherewith ye fight.
Related Commentaries of Jeremiah 21:4
Jeremiah 21:4
4 Thus saith the LORD God of Israel; Behold, I will turn back the weapons of war that are in your hands, wherewith ye fight against the king of Babylon, and against the Chaldeans, which besiege you without the walls, and I will assemble them into the midst of this city.