(Rev. 19:11 KJV) 11 And I saw heaven opened, and behold a white horse; and he that sat upon him was called Faithful and True, and in righteousness he doth judge and make war.
This is the beginning of the Second Coming. Jesus is on His white horse ready for battle. He is the Redeemer and now we see Him as the Judge and Warrior to take vengeance on those who would not obey Him. He will destroy and judge Satan and his armies.
(Ps. 96:13 KJV) 13 Before the LORD: for he cometh, for he cometh to judge the earth: he shall judge the world with righteousness, and the people with his truth.
(2 Thess. 1:7-8 KJV) 7 And to you who are troubled rest with us, when the Lord Jesus shall be revealed from heaven with his mighty angels,
8 In flaming fire taking vengeance on them that know not God, and that obey not the gospel of our Lord Jesus Christ:
This will end the Great Tribulation period.