Then I saw three impure spirits that looked like frogs;they came out of the mouth of the dragon, out of the mouth of the beast and out of the mouth of the false prophet. 14 They are demonic spirits that perform signs, and they go out to the kings of the whole world, to gather them for the battle on the great day of God Almighty… Then they gathered the kings together to the place that in Hebrew is called Armageddon. (Revelation 16:13-14,16 NIV)
The tribulation period will end with the satanically inspired armies of the Antichrist getting completely defeated by the heavenly armies of God. Notice here that three demonic spirits are sent out specifically to deceive those who dwell on the world with great signs and wonders. These are people who have already rejected the love, the miracles, and the prophecies of the one true God who has made a way for all people to repent and be saved of their sins. However, because they rejected the way that God provided, Gold will send them a strong deception so that they will be fooled into joining the Devil in His hopeless battle against God. They will be punished for choosing to love themselves instead of loving God.
This battle will take place in the valley in northern Israel known as “armageddon” or the valley of Megiddo. Actually, this will probably on be the center point of the battle. Indeed, the armies of the Antichrist will probably overflow into most of what we call the land of Israel today. They will show their hatred for God by attacking the Jews living in Jerusalem at the time. Jesus will come down from heaven and destroy them. Their blood will flow 180 miles down into the Jordan valley and eventually into the dead sea (Revelation 14:20).
Some people are confused on how the Jews could be the defenders of Jerusalem, when Jerusalem will be occupied by the Antichrist during the end times. Here is what will happen as far as I can tell:
The Antichrist will invade Israel during the midpoint of Daniel’s 70th week and conquer Jerusalem (Daniel 9:27, 11:41, Matthew 24:15-20). The Israeli Jews will flee into south western Jordan will God will provide protection for them for 1,260 days (Daniel 11:41, Revelation 12:6,14-16). Meanwhile, the Gentile invaders will occupy Israel and Jerusalem for 42 months (Revelation 11:2). After 1,263 days Jerusalem will be hit by a strong Earthquake (Revelation 11:13). At this point it is likely that the Israeli Jews will counter attack out of the Jordanian wilderness and retake Jerusalem. The Antichrist will be come angry when he hears this news (Daniel 11:44-45) and will bring a huge army to Israel. The battle will be joined at some point shortly thereafter, probably on day 1,290 (Daniel 12:11). The forces of the Antichrist will defeat the Jews at first and capture half of Jerusalem (Zechariah 14:1-2). But then Jesus, the one who has been “pierced” by the Jews, will come and save them (Zechariah 12:10). He will come down on the mount of olives, the same place from where He ascended to heaven 2,000 years ago (Zechariah 14:4, Acts 1:12). He will then deliver the Jews from their enemies, and completely destroy those who made war against them (Daniel 11:45, Revelation 19:20).