The name is found in Revelation 16:16, and means literally "The Mountain of Destruction." It references the place where the Lord destroyed Israel's enemies before the Israeli armies of Gideon, and of Jehoshaphat. On both of these occasions, the slaughter of the foes' armies was terrible and the rout was complete (Judges 8; 2 Chronicles 20). These are believed to be types or illustrations of the "time of troubles such as was not since there was a nation" in the end of this Christian era. Then the whole world will be gathered together for the battle of the great day of God the Almighty. (Daniel 12:1; Revelation 16:16; Zephaniah 3:8.) 

As a matter of fact, the opposing hosts of this last final conflict are gathering at this present time. The spirit of revolution and anarchism in the world is generating a boiling, seething condition of affairs. The warring political factions, the militant religious armies, the socialists, the nihilists, the anarchists, the labor organizations, the capitalistic combinations, and the ecclesiastical systems, all in opposition to each and all, are rushing headlong to the Mountain of Destruction–Armageddon. The nations of the earth are already gathering together to try to keep the commercial, financial and political systems from collapsing. They associate out of fear. Just as Jesus foretold, "men’s hearts failing them from fear and the expectation of those things which are coming on the earth…" Luke 21:26.  Armageddon will truly be an awful place of destruction with all the world engaged in that last final struggle!

However, right after Armageddon, Christ will establish His peaceable kingdom on earth. Zephaniah 3:8, 9:

“Therefore wait for Me,” says the LORD,
“Until the day I rise up for plunder;
My determination is to gather the nations
To My assembly of kingdoms,
To pour on them My indignation,
All My fierce anger;
All the earth shall be devoured
With the fire of My jealousy.

“For then I will restore to the peoples a pure language,
That they all may call on the name of the LORD,
To serve Him with one accord."

Christ destroys the sinful governments of the earth not with literal fire. But the fire of His jealousy. He jealously wants mankind to learn of Him and wants their worship! Right after the old order is destroyed, then all will serve God with one accord! See also Isaiah 2:2-4, 11:9, Zechariah 14:9.