History reveals the great city of Babylon was conquered in one night, without resistance, in 539 BC by Cyrus the Great. Revelation 14:8 reads:
14:8 And there followed another Angel, saying, Babylon is fallen, is fallen, that great citie, because she made all nations drink of the wine of the wrath of her fornication.
Reminds me of the trilogy of movies. Angel has Fallen. Olympus has Fallen. London has Fallen. The Empire of the City.