"Therefore thus saith the Lord concerning the king of Assyria, He shall not come into this city, nor shoot an arrow there, nor come before it with shield, nor cast a bank against it. By the way that he came, by the same shall he return, and shall not come into this city, saith the Lord. For I will defend this city, to save it, for Mine own sake, and for My servant David's sake" (Verses 29-34).
That very night deliverance came. "The angel of the Lord went out, and smote in the camp of the Assyrians an hundred fourscore and five thousand" (Verse 35)...
Tidings of this terrible judgment upon the army that had been sent to take Jerusalem, soon reached Sennacherib, who was still guarding the approach to Judea from Egypt. Stricken with fear, the Assyrian king hasted to depart and "returned with shame of face to his own land" (Verse 21). But he had not long to reign. In harmony with the prophecy that had been uttered concerning his sudden end, he was assassinated by those of his own home, "and Esarhaddon his son reigned in his stead" (Isaiah 37:38). (Prophets and Kings, 361)
Reflection: The honor of God was vindicated before the surrounding nations. The boastful Assyrian king and his army were defeated.