John Gill's Exposition of the Whole Bible
Isaiah 36:9
How then wilt thou turn away the face of one captain of the least of my master's servants,.... Be able to resist him; or be a match for him; or cause him to flee; the least captain or general in the army having, as Kimchi says, two thousand men under him; and therefore, if Hezekiah could not produce two thousand men, to sit upon so many horses offered, he could not be a match for, or hope to conquer, or cause to flee, the least officer in the army, who had the fewest men under him, and much less conquer, or cause to flee, the whole Assyrian army. Some think Rabshakeh means himself, but that does not seem likely, that Sennacherib should send an inferior officer, or a person of a low character, and in a low station, or that such an one should be the principal speaker; nor does it suit with the imperious and haughty disposition of Rabshakeh to speak in such a manner of himself:
and put thy trust on Egypt for chariots, and for horsemen? for to what purpose was it to seek and send to Egypt for chariots and horses, since he had not a sufficient number of men to put upon them, but must be obliged to have men, as well as horses and chariots; and which, as before observed, it was a vain thing to trust to, and was quite needless, when he might have enough from his master, the Assyrian king, would he agree with him.