Armageddon or Harmagedon
The word Armageddon or Armageddon is mentioned in the Bible only in Rev.16:16., and it is the great final battle between the King of Kings and the trilogy of the Antichrist of Rev.16:13: The dragon, the beast, and the false prophet.
Rev.19:11-21 deals with it again... but the great battle is never described, only the results, because this Great Battle had already been won by the Lamb at Calvary... and Armageddon is the symbol of the complete and final victory of Jesus in his Church against Satan and his followers, which is the core of the whole book of Revelation.
The Great Battle of Armageddon has been already won, and it is your victory, right now!... you just have to believe in Jesus, and do whatever he tells us to do: Baptize yourself in his Church, and receive Him daily in the Eucharist, our daily bread of Matt.6:13... because said: "Very truly, I tell you, unless you eat the the flesh of the Son of Man and drink his blood, you have no life in you. Those who eat my flesh and drink my blood have eternal life, and I will raise them up on the last day"; for my flesh is true food and my blood is true drink" (John 6:53-55).
If you believe in Jesus, but you don't do hat he tells us to do, you are chitin yourself, you just don't beleive in Jesus!... it is like if you say you believe in your Doctor but you don't take the medicines he gives to you, you actually don't believe in your Doctor!.
Please, see Eucharist and The Church