Matthew Poole and continuators on Nahum 3:15

15 There shall the fire devour thee: the sword shall cut thee off: it shall eat thee up like the canker worm : make thy self many as the canker worm, make thy self many as the locusts.

In the very Fortresses.

Either literally, or figuratively, the wrath of the Enemy hot as fire, or the Pestilence, or all together

Of the Chaldeans, their Wars (after all that the Scythians have done against thee) these shall utterly destroy thee.

This tells us the manner how the Ninevites shall be destroyed, they shall be eaten up:

Either the Enemy shall as easily eat thee up, as the Canker worm eats the green Herb; or thou shalt as soon be devoured as Canker worms are destroyed by storms, rain, fire, or change of weather.

They are innumerable, be thou so if thou canst be, all will be to no purpose.

The same Ironie repeated, when the Ninevites have done all they can, they shall as fully, and s[illegible: 1 letter]ddenly be destroyed as these Vermin are.