What events happen right before the beginning of the millennium in Revelation 20?
As the Tribulation runs its course, the Battle of Armageddon takes place, Christ returns and crushes the armies gathered in the Middle East, and then an angel comes down from heaven with the key of the bottomless pit and a great chain to bind Satan for 1,000 years, preparing the onset of the Kingdom.
Les explains that Revelation 20 is where the Kingdom is finally brought down to a particular time frame, after the Old Testament, Jesus, and Paul spoke of the Kingdom without such a time frame. Right before the millennium, the Tribulation has run its course, the Battle of Armageddon has taken place, and Christ has returned and crushed all the armies gathered in the Middle East. Then, as Revelation 20:1 shows, an angel comes down from heaven with the key of the bottomless pit and a great chain. Les qualifies that Satan is a spirit being, so the chain is not necessarily iron but a chain of God's doing, showing that God confines him so he can no longer carry out his work of opposition. Satan is bound for 1,000 years.