John Gill Commentary Isaiah 25:12

"And the high fortress of thy walls hath he brought down, laid low, and brought to the ground, even to the dust." — Isaiah 25:12 (ASV)

And the fortress of the high fort of thy walls shall he
bring down
That is, their high and, fenced walls, which were about their cities, the fortifications of them; these should be destroyed by the Lord, be battered and brought down, not being able to stand against his mighty power.

The Targum renders it, ``the mighty city, the cities of the nations;'' and may design the city of Rome, and the cities of the nations that shall fall at the pouring out of the seventh and last vial, (Revelation 16:19)

it follows, lay low, [and] bring to the ground, [even] to the dust ;
which variety of words without any copulative are used to express the sudden, quick, certain, and irrecoverable destruction of such fortified city, or cities, and their fortifications.