That night. That is, the night following the day in which Isaiah’s prophecy was delivered.
Smote. “All the mighty men of valour, and the leaders and captains in the camp of the king of Assyria” (2 Chron. 32:21). Perhaps most of the army that had been sent to take Jerusalem was slain.
When they arose. The apparent incongruity of the latter part of this verse disappears when it is observed that the subject of the sentence is indefinite and general, as if the sentence read, “when people rose up.” That is, when those who were left of the army rose up the next morning all of their comrades (the 185,000 that the angel had slain) had become corpses.