Go ye up upon her walls - This is the permission and authority given to the Chaldeans to pillage Jerusalem.
Take away her battlements - Some translate נטישות netishoth, branches; others, vines. Destroy the branches, cut down the stem; but do not damage the root. Leave so many of the people that the state may be regenerated. The Septuagint, Syriac, and Arabic, read, "Leave her foundations, for they are the Lord's;" and this agrees with "Destroy, but make not a full end."
Her walls - It is Possible that not the city walls, but those of a vineyard are meant. Judaea is God‘s vineyard Isaiah 5:1-7, and God permits the enemy to enter the vineyard to destroy her.
Battlements - tendrils. The tendrils and branches of Judah‘s vine are given up to ruin, but not the stock. See Isaiah 6:13 note.