Joel mentions that God(Yaweh) will bring all nations to a valley of judgement (variously called valley of Jehosephat and also Valley of Meggiddo). Joel 3:2 'I will gather all the nations, and bring them down to the valley of Jehosephat. Then I will enter into judgement with them there on behalf of My people and my inheritance, Israel, whom they have scatterred among the nations; and they have divided up My land, they have also cast lots for My people....taken My silver and My gold, brought My precious treasures to your temples...
so it seems that God will again fight for his people israel (firstfruits of many to come) - but also for the world to be free of enslavement to cross-purposes of God's eternal will. In Joel 2:28 - it mentions at this time 'I will pour out my Spirit on ALL mankind; and your sons and daughters will prophecy, your old men will dream dreams, your young men will see visions. and even on male and female servants (poor) i will pour out My Spirit in those days. And, I will display wonders in the sky and on the earth - blood, fire, and columns of smoke (not from man's armies now - but God's own army - with angels) - the sun will be turned into darkness, and the moon to blood, before the great and awesome day of the Lord comes....
And, it will come about that WHOEVER calls on the name of the Lord will be delivered; for on Mount Zion (all those who are God's) and in Jerusalem there will be those who escape, as the Lord has said even among the survivors whom the Lord calls.
The judgement of God is first upon the House of God. He says in Amos 2:4 that the judgement of Judah is because they rejected the law of the Lord, have not kept His statutes; have lied and gone astray after false gods, and walked after the ways of their fathers....' And, yet - His purpose through the prophets is to get people to repent so that He will relent and change his mind about the degree of the punishment of all nations. Amos 3:3 says 'If a trumpet is blown in a city will not the people tremble? If a calamity occurs in a city has not the Lord done it (allowed it)? Surely, the Lord does nothing unless He reveals His secret counsel to His servants the prophets.
Yeshua was the greatest of the prophets - and also messiah - when he spoke to Israel of the last days in Matthew 24:4-51 vs. 14 'and this gospel of the kingdom shall be preached in the whole world as a witness to all the nations, and then the end shall come.' Interestingly, Yeshua quotes the OT prophets when he says in vs. 29 'and immediately after the tribulation of those days the sun will be darkened, and the moon will not give it's light,a nd the stars will fall from the sky, and the powers of the heavens will be shaken, and then the sign of the Son of Man will appear in the sky, and all the tribes of the earth will mourn, and they will see the Son of Man coming on the clouds of the sky with power and great glory. and He will send forth his angels with A GREAT TRUMPET and they will gather together his elect from the four winds, from one end of the sky to the other.'
Now - i used to wonder 'sky' - rapture? what? but, it means - the dead in Christ (Yeshua) will rise first and then those that are left at his coming. So...to feel that 'swoosh' of instant change. The bible doesn't say anyone will change to spirit until the 'day of His coming.' That is why many places say we must patiently wait and that some will be 'hidden.' Israel was hidden from Pharoah and his armies - so there is no surprise that God can hide his elect.