One of the biggest and probably the most known of biblical things that is said to occur is the Armageddon Battle. This is a 3 phase war that takes place during the 7 year tribulation. The Bible says that Russia will be driven back and its army almost destroyed. Then the remaining Russian forces will attack and this time China will also, and China or Russia may also unleash a nuclear attack against the U.S.
At this time, then the Bible says that all remaining armies of the world will gather against Israel during the end of the 7 year tribulation, at the climax of this phase of the battle, the Lord will return with his saints from heaven to put a stop to all war forever, and Jesus will set up his kingdom on the earth.