After the marriage of the Lamb, the apostle John presents the opening of heaven and the majestic appearance of Jesus Christ upon a white horse (Rev 19:11).

Jesus is described with a fearful physical appearance which emphasized His divine purpose of carrying out His Father's judgment (Rev 19:12-15).

Assisting Jesus Christ, in carrying out God's judgment, are the unfallen angels in heaven (Rev 19:14, 17-18; Matt 13:41-42).

Against the background that God's people do not possess their promised land (Dan 2:33, 40-43; 7:7-8, 11, 19-26), Satan, with the intent of denying Jesus Christ Jerusalem, the city of God (Dan 9:19), arrays a huge army at Armageddon (Rev 17:7-13; 19:19).

So decisive was the military victory that the Antichrist and False Prophet were seized without having any time to escape and were justly tossed into the lake of fire (Rev 19:20-21).

In view of God's wrath being final (Rev 15:1), the angel told to reap the earth (Rev 14:18-19), and the angel standing in the sun calling upon the birds to feed upon "the flesh of all men, both free men and slaves, and small and great" (Rev 19:21), it appears that all of humanity left on earth is destroyed.

Satan himself does not escape, and is sealed and imprisoned in the abyss for one thousand years (Rev 20:1-3).

This event brings to conclusion several events:

This concludes the metaphor of reaping by the angel (Rev 14:17-20).

This concludes the third cause of sympathy (third woe) expressed by the eagle (Rev 8:13) and presumably by an angel (Rev 11:14).

This concludes, completes and fulfills Daniel's prophecy of 70 weeks.

Seventy weeks have been decreed for your people and your holy city, to finish the transgression, to make an end of sin, to make atonement for iniquity, to bring in everlasting righteousness, to seal up vision and prophecy and to anoint the most holy place. (Dan 9:24)

For deeper study:

The Juxtaposition of the Marriage and Armageddon

Seventy Weeks