וְנָפַ֤ל אַשּׁוּר֙ בְּחֶ֣רֶב לֹא־אִ֔ישׁ וְחֶ֥רֶב לֹֽא־אָדָ֖ם תֹּֽאכֲלֶ֑נּוּ וְנָ֥ס לוֹ֙ מִפְּנֵי־חֶ֔רֶב וּבַחוּרָ֖יו לָמַ֥ס יִהְיֽוּ׃
Then shall Asshur fall with the sword, not of man, And the sword, not of men, shall devour him; And he shall flee from the sword, And his young men shall become tributary.
Ibn Ezra on Isaiah
With a sword, not of a mighty man, but with the drawn sword of an angel. The sword is a figurative expression.
Ibn Ezra on Isaiah
And his young men that will have escaped shall be discomfited, shall be overtaken on the ways in which they try to flee.