ישעיהו י:יח פירוש: רש״י ואבן עזרא

And the glory of his forest and his stately forest They are his numerous armies.

And the glory of his forest and of his fruitful field. A figure, signifying that his armies would be as numerous as the trees of the forest, and as the ears of a fruitful field.

כַּרְמֶל is a tall forest.