And exactly when did the "Word of God" "smite the nations" and "rule them with a rod of iron" (Revelation 19:13-15), and the "rest were killed with the sword which came from the mouth of him who sat upon the horse, and all the birds were filled with their flesh", with respect to those who worshipped the beast and his false prophet (Revelation 19:20-21). And by the way, who was that "false prophet" of Revelation 19:20?
The false prophet was Titus.
Titus, the little horn, is also called the false prophet to the beast in Revelation 19:20: “But the beast was captured, and with him
the false prophet who had performed the miraculous signs on his behalf.”
Titus, the son of the beast, Emperor Vespasian, is the mouth of the beast of Revelation 13:5-6, the little horn of Daniel 7 and the false prophet of Revelation 19:20. Note the repetition ...
For historical testimony of how Titus LITERALLY spoke blasphemies against God and his dwelling place see Revelation 13.
The birds?
The symbol of Rome was the eagle, the Aquila. The eagle, the Aquila, was the main ensign of the Roman legions and would have been visible high above the heads of the soldiers at the top of long poles held by the Roman standard bearers. So when the Roman army arrived to besiege the cities of Israel during the Jewish War metal eagles would have been seen held up above and amidst the ranks of the various legions.
These eagles held high by their standard bearers are also “the birds flying in midair.” And like eagles viciously attacking their prey, Rome slaughtered their Israelite enemies. “The flesh of the kings, generals and mighty men, of horses and their riders, and the flesh of all people, free and slave, small and great” is the flesh of the apostate Jews that these eagles representing Rome consumed.
Revelations repeats itself with different symbolism for the same people or events. Its confusing, but that's the nature of poetic apocryphal language.