Revelation chapter 18 is the fulfillment of the destruction of the city of Babylon that had been predicted in both the proleptic message of the angel declared in Revelation 14:8 NLT; "Then another angel followed him through the sky, shouting, “Babylon is fallen—that great city is fallen—because she made all the nations of the world drink the wine of her passionate immorality.” and the pouring out of the judgment of the 7th bowl in Revelation 16:19 NLT; "The great city of Babylon split into three sections, and the cities of many nations fell into heaps of rubble. So God remembered all of Babylon’s sins, and he made her drink the cup that was filled with the wine of his fierce wrath." The city of Babylon, the sit of the government of the antichrist will finally be destroyed suddenly.