According to Berosus, the Babylonian priestly historian, the camp of Sennacherib was visited in the night by swarms of field mice which ate up the quivers and bows and the (leather) handles of shields. Next morning the army fled.
The Biblical account of the disaster is as follows:
And it came to pass that night, that the angel of the Lord went
out, and smote the camp of the Assyrians an hundred and four score
and five thousand: and when they arose early in the morning,
behold, they were all dead corpses. So Sennacherib king of Assyria
departed, and went and returned and dwelt at Nineveh.
A pestilence may have broken out in the camp, the infection, perhaps, having been carried by field mice. Byron’s imagination was stirred by the vision of the broken army of Assyria.
The Assyrian came down like a wolf on the fold,
And his cohorts were gleaming with purple and gold;
And the sheen of their spears was like stars of the sea,
When the blue wave rolls nightly on deep Galilee.
Like the leaves of the forest when summer is green,
That host with their banners at sunset were seen;
Like the leaves of the forest when autumn hath blown,
That host on the morrow lay withered and strown.
For the Angel of Death spread his wings on the blast,
And breathed on the face of the foe as he passed;
And the eyes of the sleepers waxed deadly and chill,
And their hearts but once heaved–and forever grew still!
And there lay the steed with his nostril all wide,
But through it there rolled not the breath of his pride;
And the foam of his gasping lay white on the turf,
And cold as the spray of the rock-beating surf.
And there lay the rider distorted and pale,
With the dew on his brow, and the rust on his mail;
And the tents were all silent–the banners alone–
The lances uplifted–the trumpet unblown.
And the widows of Asshur are loud in their wail,
And the idols are broke in the temple of Baal;
And the might of the Gentile, unsmote by the sword,
Hath melted like snow in the glance of the Lord.
Before this disaster occurred Sennacherib had to invade Babylonia again, for the vassal king, Bel-ibni, had allied himself with the Chaldaeans and raised the standard of revolt.
The city of Babylon was besieged and captured, and its unfaithful king deported with a number of nobles to Assyria. Old Merodach Baladan was concerned in the plot and took refuge on the Elamite coast, where the Chaldaeans had formed a colony. He died soon afterwards.”
Donald A. Mackenzie, Myths of Babylonia and Assyria, 1915, pp. 466-7.