Revelation 16:12-16 - The Sixth Bowl
12 And the sixth [angel] poured out his bowl on the great Euphrates River and its water was dried up, so that the road would be prepared for the kings from the east [to travel on]. 13 And I saw three evil spirits that looked like frogs; [one was] coming out of the mouth of the dragon, [one] out of the mouth of the beast, and [one] out of the mouth of the false prophet. 14 For they are spirits of demons, which perform [supernatural] signs. These spirits go out to the kings of the whole world to assemble them for battle on the great day of Almighty God.
15 [Note: At this point the Lord's voice breaks into John's vision]. ("Look, I am coming like a thief. That person is happy who stays alert and is dressed [properly], so he does not appear naked and have to be shamefully exposed").
16 So, the [demonic] spirits assembled the kings together at the place which is called "Armageddon" in Hebrew. [Note: "Armageddon" means "mountain of Megiddo" and was a site in northwestern Palestine where several decisive battles had been fought centuries earlier. See Judges 4,5,7].