Revelation 16:14-16
for these are the spirits of demons, working miracles, which go forth to the kings of the whole world, to bring them together to the battle of that great day of God Almighty.
Revelation 19:14
And the armies which are in heaven followed him, riding on white horses, clothed in fine linen, white and clean.
Revelation 19:19-20
And I saw the beast, and the kings of the earth, and their armies gathered together to make war with him who sits upon the white horse, and with his army.
Revelation 20:8-9
and he shall go forth to deceive the nations which are in the four corners of the earth. Gog and Magog, to gather them together for war; whose number is like the sand of the sea.