From the booklet of the same name, available for free download at Monergism Books. Pitchford writes from the perspective that God has always had a “people” – and only one “people.” The present writer would affirm Mr. Pitchford’s point.
Revelation chapter twenty must be interpreted in light of its genre: Revelation is a book full of symbolic visions and numbers.
Revelation 1:4 John to the seven churches that are in Asia: Grace to you and peace from him who is and who was and who is to come, and from the seven spirits who are before his throne, [Unless there are literally seven Holy Spirits, the reader has to acknowledge a symbolic use of numbers here.]
Revelation 1:20 As for the mystery of the seven stars that you saw in my right hand, and the seven golden lampstands, the seven stars are the angels of the seven churches, and the seven lampstands are the seven churches.
Revelation 17:9-12 This calls for a mind with wisdom: the seven heads are seven mountains on which the woman is seated; they are also seven kings, five of whom have fallen, one is, the other has not yet come, and when he does come he must remain only a little while. As for the beast that was and is not, it is an eighth but it belongs to the seven, and it goes to destruction. And the ten horns that you saw are ten kings who have not yet received royal power, but they are to receive authority as kings for one hour, together with the beast.
In other places in Revelation, the final consummation of all history has already been reached; therefore, chapter twenty is likely another “recapitulation,” a different symbolic way of describing the New Testament era, followed by a description of the end of history.
Revelation 11:15-19 Then the seventh angel blew his trumpet, and there were loud voices in heaven, saying, “The kingdom of the world has become the kingdom of our Lord and of his Christ, and he shall reign forever and ever.” And the twenty-four elders who sit on their thrones before God fell on their faces and worshiped God, saying, “We give thanks to you, Lord God Almighty, who is and who was, for you have taken your great power and begun to reign. The nations raged, but your wrath came, and the time for the dead to be judged, and for rewarding your servants, the prophets and saints, and those who fear your name, both small and great, and for destroying the destroyers of the earth.” Then God’s temple in heaven was opened, and the ark of his covenant was seen within his temple. There were flashes of lightning, rumblings, peals of thunder, an earthquake, and heavy hail.
Revelation 14:14-16 Then I looked, and behold, a white cloud, and seated on the cloud one like a son of man, with a golden crown on his head, and a sharp sickle in his hand. And another angel came out of the temple, calling with a loud voice to him who sat on the cloud, “Put in your sickle, and reap, for the hour to reap has come, for the harvest of the earth is fully ripe.” So he who sat on the cloud swung his sickle across the earth, and the earth was reaped.
Revelation 16:17-21 The seventh angel poured out his bowl into the air, and a loud voice came out of the temple, from the throne, saying, “It is done!” And there were flashes of lightning, rumblings, peals of thunder, and a great earthquake such as there had never been since man was on the earth, so great was that earthquake. The great city was split into three parts, and the cities of the nations fell, and God remembered Babylon the great, to make her drain the cup of the wine of the fury of his wrath. And every island fled away, and no mountains were to be found. And great hailstones, about one hundred pounds each, fell from heaven on people; and they cursed God for the plague of the hail, because the plague was so severe.
Revelation 19:11-21 Then I saw heaven opened, and behold, a white horse! The one sitting on it is called Faithful and True, and in righteousness he judges and makes war. His eyes are like a flame of fire, and on his head are many diadems, and he has a name written that no one knows but himself. He is clothed in a robe dipped in blood, and the name by which he is called is The Word of God. And the armies of heaven, arrayed in fine linen, white and pure, were following him on white horses. From his mouth comes a sharp sword with which to strike down the nations, and he will rule them with a rod of iron. He will tread the winepress of the fury of the wrath of God the Almighty. On his robe and on his thigh he has a name written, King of kings and Lord of lords. Then I saw an angel standing in the sun, and with a loud voice he called to all the birds that fly directly overhead, “Come, gather for the great supper of God, to eat the flesh of kings, the flesh of captains, the flesh of mighty men, the flesh of horses and their riders, and the flesh of all men, both free and slave, both small and great.” And I saw the beast and the kings of the earth with their armies gathered to make war against him who was sitting on the horse and against his army. And the beast was captured, and with it the false prophet who in its presence had done the signs by which he deceived those who had received the mark of the beast and those who worshiped its image. These two were thrown alive into the lake of fire that burns with sulfur. And the rest were slain by the sword that came from the mouth of him who was sitting on the horse, and all the birds were gorged with their flesh.