Isaiah 37:36

Then the angel of the Lord went forth

The destruction of Sennacherib’s army

The narrative does not say here (but see Isaiah 30:30) what secondary means, if any, were used.it does not exclude the use of secondary means. As Dean Plumptre remarks, a modern historian would dwell on the details of the pestilence. To Isaiah, who had learnt to see in the winds the messengers of God Psalms 104:4), it was nothing else than the “angel of the Lord.” (Expository Times.)

A parallel in English history

In English history there is a striking parallel to the events of this period of Jewish history. Edward VI., under the guardianship of Cranmer, had established a pure form of religious worship in England. On his death, Queen Mary upset everything, and drove into retirement those who escaped the fires of Smithfield for their allegiance to the Protestant faith. With Elizabeth a new era dawned, and the religious life of the country displayed itself in great enthusiasm, resulting in the overthrow of the Armada. The reign of Ahaz was like unto that of Mary; with the accession of Hezekiah begins a reign like unto that of Elizabeth, having in its course the magnificent defeat of Sennacherib’s hosts by the arm of the Lord. (B. Blake, B. D.)