At the time Isaiah wrote this, the kingdom of Judah was relatively strong. There was no reason to predict its ruin. Yet by the spirit of prophecy, Isaiah knew that the people would ripen in wickedness, even as Sodom, thereby bringing upon themselves the judgment of God. This judgment occurred on multiple occasions. First, the Jews were sacked by the Babylonians in approximately 587 BC. Second, the Jews were sacked by the Romans in 70 AD. Third, the Jews will be sacked by a group of Gentile nations in the last days (Rev 11:2, Zech 14:2). There were other times when the city was taken, by other armies, etc., but the city was not destroyed as in these three instances. We have seen Isaiah's prophetic dualism (the multiple applications of one prophecy) before. Here we see that Isaiah's prophecy refers to all three events.