In Revelation 19:17-21, the Battle of Armageddon ends with the destruction of the wicked. The beast, known as the Antichrist, and the false prophet are cast into the lake of fire. John sees the vision of all the armies who war against God and the true Christ totally and completely defeated. The birds of prey come to feast on the flesh of their dead bodies.
The destruction of the wicked makes way for the Millennium (Rev. 20:4-6). God's Kingdom comes upon earth in all of its fullness. For centuries God's people have prayed, "Your kingdom come. Your will be done on earth as it is in heaven" (Matthew 6:10). Now our King, the Lord Jesus Christ will rule with a rod of iron (Rev. 19:15). His will shall be done.
Armageddon ends abruptly, when the King of Kings speaks the word. Those opposing armies become immediately lifeless. In apocalyptic imagery, John saw the sword come out of His mouth. "And the rest were killed with the sword which proceeded from the mouth of Him who sat upon the horse. And all the birds were filled with their flesh" (Rev. 19:21).
The destruction of the wicked comes by the word of Jesus our Lord. His word is with absolute authority and power. Those who have enmity against God and His Son meet certain and sure defeat. The Lord God omnipotent reigns. His kingdom rules over all. "For the word of God is living and powerful, and sharper than any two-edged sword" (Hebrews 4:12).