וְנָפַ֤ל אַשּׁוּר֙ בְּחֶ֣רֶב לֹא־אִ֔ישׁ וְחֶ֥רֶב לֹֽא־אָדָ֖ם תֹּֽאכֲלֶ֑נּוּ וְנָ֥ס לוֹ֙ מִפְּנֵי־חֶ֔רֶב וּבַחוּרָ֖יו לָמַ֥ס יִהְיֽוּ׃
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.