Verses 1-5: The Summons and Preparation for Judgment. Isaiah introduces the burden against Babylon, calling for a banner to be raised and the gathering of God's mighty ones to execute His wrath. The imagery of a great army coming from afar highlights the certainty and divine origin of the judgment.
Verses 6-12: The Terror of the Day of the LORD. This section describes the fearful effects of God's coming judgment, including fainting hands, melting hearts, and cosmic disturbances such as darkened sun and moon. The day is portrayed as cruel and fierce, punishing the wicked and humbling the proud.
Verses 13-22: The Desolation of Babylon. The final section details the aftermath of judgment: the land shaken, people fleeing, brutal destruction of families, and the rise of the Medes as instruments of God's wrath. Babylon is depicted as utterly desolate, abandoned like Sodom and Gomorrah, inhabited only by wild beasts and ominous creatures.