Jehovah has made of a city of the nations a heap and of a fortified town of the nations a ruin (25:2a). Because of Jehovah's reaction, a palace of strangers becomes no city at all; it will never be rebuilt. Therefore, a strong people will glorify Jehovah; the cities of terrifying nations will fear Him (vv. 2b-3).
In 25:10b-12 we see that Moab will be threshed in his place by Jehovah, even as straw is threshed in the water of a dung heap. Moab will spread out his hands in the middle of the water, as a swimmer spreads out his hands to swim. But Jehovah will abase his pride together with the trickery of his hands. The lofty fortification of his walls Jehovah will bring down, lay low, and cast to the ground, even to the dust.
According to 26:5 and 6, Jehovah has brought down those who dwell on high, the lofty city. He lays it low to the ground; He casts it into the dust. The foot of the poor and the steps of the weak will trample it.
Isaiah 26:14 tells us that Jehovah has visited and destroyed those who assumed to be lords over Israel. He has caused all memory of them to perish.
Isaiah 26:21 speaks of Jehovah coming forth from His place to punish the inhabitants of the earth for their iniquity. The earth will reveal her bloodshed and will no longer conceal her slain.
Finally, 27:1 reveals that in His reaction to the nations' excessive action on Israel, Jehovah will punish, with His harsh, great, and mighty sword, leviathan, the fleeing serpent and the crooked serpent. He will slay the dragon (or, monster) that is in the sea.