This War Must Happen: “I will gather all the nations and bring them down to the Valley of Jehoshaphat. There I will enter into judgment against them concerning My people, My inheritance, Israel, whom they have scattered among the nations as they divided up My land." Joel 3:2

God Plan Ultimately after this war is for their to be peace on earth:

"He shall judge between many peoples, and shall decide disputes for strong nations far away; and they shall beat their swords into plowshares, and their spears into pruning hooks; nation shall not lift up sword against nation, neither shall they learn war anymore;" Micah 4:3