And the fortress of the high fort of thy walls shall he bring down, lay low, and bring to the ground, even to the dust.
The fortress - the strongholds of Moab, the representative of the foes of God's people; also Babylon. The anti-Christian powers of the world are represented as a city (Revelation 11:8).
Remarks: As in Isaiah 12:1-6, after the prophecy of Messiah's coming reign over restored Israel and Judah, so also here in this chapter the literal and the spiritual Israel are introduced as singing a song of praise for the "wonderful things" which God hath done on their behalf. Nothing so fills the heart and the mouth with thanksgivings as to be able to say with appropriating faith, "O Lord, thou art my God." For though the Lord's people be now "poor and needy," the Lord is their "strength." The very violence of "the terrible ones" only drives the Lord's people the more to Him who is "a refuge from the storm."