This 29th message of the book of Zechariah begins with chapter 12 and verse 9 continuing the campaign of Armageddon.
Zechariah 12:9
9And it shall come to pass in that day, that I will seek to destroy all the nations that come against Jerusalem (ASV 1901).
At the third stage of the Campaign of Armageddon all the armies of the world will come against Jerusalem in a final attempt to destroy the nation Israel. The national regeneration of the nation Israel is the general theme of Zechariah chapter twelve. It is tied to the destruction of Babylon, which will be the world headquarters of the Antichrist (Jeremiah 50:43 etc.). The destruction of Babylon is the second stage of the Campaign of Armageddon.
Jeremiah 50:4-5
4In those days, and in that time, saith Jehovah, the children of Israel shall come, they and the children of Judah together; they shall go on their way weeping, and shall seek Jehovah their God. 5They shall inquire concerning Zion with their faces thitherward, saying, Come ye, and join yourselves to Jehovah in an everlasting covenant that shall not be forgotten (ASV 1901).