Charles Ellicott 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 ... —Primarily the words, as interpreted by Isaiah 25:10, point to Kir-Moab (Isaiah 15:1) as the stronghold of the nation. Beyond this they predict a like destruction of every stronghold, every rock-built fortress (2 Corinthians 10:5) of the great world-power of which Moab was for the time the symbol.