The central event of the end times is the Second Coming of Yeshua (Jesus). That event is real and literal. The clearest two passages in the Scriptures describing the Second Coming are Revelation 19 and Zechariah 14. Revelation 19 gives the heavenly perspective; Zechariah 14 the earthly perspective.
Revelation 19:11-15 describes the heavens open and Yeshua leading the heavenly armies to descend in a battle. Verse 19 states that Yeshua comes to destroy the combined forces of the armies of the nations gathered together on earth. However, it doesn't state where on earth they are gathered. The reason that the location isn't stated in the book of Revelation is that it is already stated in the book of Zechariah.
Zechariah 14:2 – "I will gather all the nations to battle against Jerusalem." When those nations attack, Yeshua will come forth to fight against them, defeat them, and His feet will then stand upon the Mount of Olives.
Zechariah 14:3-4 – "Then YHVH will come forth and fight against those nations, as He fights in the day of battle; and in that day His feet will stand on the Mount of Olives."
In order for Yeshua to return, Jerusalem must be re-occupied, as Yeshua predicted in (Luke 21:24). There will also be a revival of faith in Israel (Romans 11:26; Zechariah 12:10) and the people of Jerusalem will cry out to invite Yeshua to return (Matthew 23:39). In order for an international attack on Israel to take place, there must be a worldwide organization uniting the nations (such as the UN) and a worldwide religion (such as Islamic extremism) inciting the nations to "wipe Israel off the map."
Although the armies of the nations will believe that they are justified to attack Jerusalem, the attack will be seen by heaven as an attack against Yeshua Himself. (Revelation 19:19 – "I saw the beast, the kings of the earth, and their armies, gathered together to make war against Him who sat on the horse and against His army.") The political, economic and military elements that will comprise this final battle are already in place. The early stages of the battle have already begun.
Yeshua will fight against those who attack Jerusalem, whatever their religious or ethnic background. Every individual person, every national entity, and every religious group will have to decide which side to be on. Neutrality will not be an option. The issue of Jerusalem will become the "stone of offense" (Zechariah 12:3) and the "plumb line" (Amos 7:7) in the hand of the Lord through which to judge the nations.
The Second Coming of Yeshua and the battle over Jerusalem are essentially connected one to another.