For thus saith the Lord, the God of Israel,.... The destruction of Jerusalem by the Chaldeans, which was now fulfilling, is here mentioned as a pledge of the accomplishment of spiritual blessings after spoken of; and to assure the prophet, that as he would with his own eyes see the fulfilment of the prophecies he had delivered out in the name of the Lord concerning that, so likewise as certainly would the other be brought to pass:concerning the houses of this city, and concerning the houses of the kings of Judah, which were thrown down by the mounts, and by the sword; by "the mounts", which the Chaldeans raised without the city; or by the engines they placed there, by which they cast out stones into the city, to the demolishing of the houses in it; not in common only, but particularly the houses of the king and nobles, which they especially directed their shot at; and by "the sword", hammers, axes, and mattocks, for which sometimes this word is used, when they entered into the city.
Though some render the words, "which are thrown down for mounts, and for the sword" ; that mounts might be made of them within, on which the Jews might fight and defend themselves against the Chaldeans.
So the Targum,"which they pulled down, and threw up mounts to strengthen the wall, against those that kill with the sword;''and so Jarchi interprets it.