What does Revelation 16:14 mean?
This verse identifies the three unclean spirits that John saw coming out of the mouths of the dragon, the beast, and the false prophet. The symbolism of those "frogs," as they were described in the previous verse, is explained here. They are demons, and they perform miraculous signs.This passage is building to an event often referred to as a "battle," when in reality it's more of a "war," referred to using the name of a particular location: Armageddon. The mission of these three spiritual beings is to gather leaders of the world together for this conflict. The time is set for "the great day of God the Almighty." This looks ahead to Revelation chapter 19, which describes the return of Christ, who strikes down the nations and "tread[s] the winepress of the fury of the wrath of God the Almighty" (Revelation 19:15). All the armies of earth with all their deadly, sophisticated weaponry will be no match for the Almighty!
There is no scholarly consensus about the immediate reasons why these armies gather. Some teachers believe they assemble to battle the beast—the Antichrist—but why would the Devil draw men into battle against his ally? Other teachers offer a more plausible explanation. They think the international armies assemble in order to join the armies of the beast in an all-out attempt to annihilate the Jews and to dethrone God and His Son. It's possible that they may be initially brought with the intent of fighting against Antichrist, but then turn and join him to fight a common foe.