Excerpts from Books and Wikipedia
"From 704 to 681 BC, Sennacherib of Assyria defeats almost every enemy
but is remembered for one unsuccessful siege. . . . According to 2 Kings, an angel of the Lord struck 185,000 of Sennacherib’s men dead in the night: “When the people got up the next morning,” the writer tells us, “there were all the dead bodies. So Sennacherib king of Assyria broke camp and withdrew. He returned to Nineveh and stayed there.” Herodotus relays a slightly different version of events, which he says he heard from the priests of Egypt: Sennacherib decided to give up and go home because the Assyrian camp was overrun by mice, who “gnawed quivers and bows and the handles of shields.” The host of Sennacherib was suffering from an invasion of rodents, and died in their tents. The combination suggests that the plague had arrived outside Jerusalem’s walls, and that the king of Assyria retreated in the face of mounting deaths." [Bauer: Ancient World, p. 386-7]