glory of his forest - The common soldiers, the princes, officers, etc., all alike together, shall be consumed (see on Isa 9:18).
in one day - (Isa 37:36).
fruitful field - literally, “Carmel,” a rich mountain in the tribe of Asher. Figurative for Sennacherib’s mighty army. Perhaps alluding to his own boasting words about to be uttered (Isa 37:24), “I will enter the forest of his Carmel.”
soul and body - proverbial for utterly; the entire man is made up of soul and body.
as when a standard bearer fainteth - rather, “they shall be as when a sick man” (from a Syriac root) wastes away.” Compare “leanness,” that is, wasting destruction (Isa 10:16) [Maurer]. Or, “there shall be an entire dissipation, like a perfect melting” (namely, of the Assyrian army) [Horsley].