Revelation 19:16-19

16 And on His garment (robe) and on His thigh He has a name (title) inscribed, KING OF KINGS AND LORD OF LORDS.

17 Then I saw a single angel stationed in the sun's light, and with a mighty voice he shouted to all the birds that fly across the sky, Come, gather yourselves together for the great supper of God,

Look at Matthew 24:21-29 and you will see Jesus referring to this event that John is shown here in Revelation.

18 That you may feast on the flesh of rulers, the flesh of generals and captains, the flesh of powerful and mighty men, the flesh of horses and their riders, and the flesh of all humanity, both free and slave, both small and great! 

There is a great Truth here and it is that the birds eat the flesh of these people. John is not shown that the souls or the spirits of these people are destroyed, only that they die and their flesh is eaten. Instead of being buried and their flesh decay, our Father just cleans everything up quick. But grace does not cease, our Father has not abandoned these peoples souls. He has just removed their flesh and the cares of this world that go along with flesh. He has done it so that He can bring them to a place of revelation into the Truth that will set them free. Just as He did with those who Jesus went and preached to in Hades, 1 Peter 3:18-20.

19 Then I saw the beast and the rulers and leaders of the earth with their troops mustered to go into battle and make war against Him Who is mounted on the horse and against His troops. 

This is the battle of Armageddon! The demons that leaped from the mouths of satan, the anti-christ, and false prophet have miraculously gathered a great number of the tares, Matthew 13:25-30, together to fight against Jesus, Revelation 16:13. Without ships, without planes, without armored carriers, millions of those who took the mark of the beast will be super naturally gathered together at Armageddon to be destroyed as Jesus returns. This all ties right in with Matthew 24.