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John Wesley's Explanatory Notes
on the Whole Bible :

30:25 Hill - Which is commonly dry and barren. In the day - When God shall
destroy the enemies of his people. The towers - The mighty potentates*, who
fought against God's people.

*Potentates = Fyrster, magthavere.

Jamieson, Fausset & Brown Commentary :

25. Even the otherwise barren hills shall then be well-watered (#Isa 44:3).
the day, etc.--when the disobedient among the Jews shall have been slain,
as foretold in #Isa 30:16: "towers, "that is, mighty men (#Isa 2:15). Or
else, the towers of the Assyrian Sennacherib, or of Babylon, types of all
enemies of God's people.

John Gill's Expositor :

when the towers fall; not the batteries and fortifications raised in the
Assyrian camp, at the siege of Jerusalem, which fell when they were
destroyed by the angel; or the great men and princes in that army, which
then fell; though towers sometimes signify great persons, such as princes;
see #Isa 2:15 and so the Targum interprets it here; and may be true of the
antichristian princes; for of the fall of the great city of Rome, and of
other cities of the nations, with the towers thereof, is this to be
understood, even of mystical, and not of literal Babylon; see #Re 11:13.

jørgen.