Revelation 16:12-14

16:12 Then the sixth angel poured out his bowl on the great river Euphrates and dried up its water to prepare the way for the kings from the east. 16:13 Then I saw three unclean spirits that looked like frogs coming out of the mouth of the dragon, out of the mouth of the beast, and out of the mouth of the false prophet. 16:14 For they are the spirits of the demons performing signs who go out to the kings of the earth to bring them together for the battle that will take place on the great day of God, the All-Powerful.

Revelation 16:16

16:16 Now the spirits gathered the kings and their armies to the place that is called Armageddon in Hebrew.