According to Jewish and most Christian eschatology, Armageddon happens when nations that are now Muslim march against Israel and, specifically, Jerusalem in the last days. Muslim eschatology calls for the eventual destruction of Jerusalem and the Jews, and each side of this contest believes it will be serving God.
Christian eschatology explains that when Jesus descends upon the Mount of Olives that the Antichrist forces from the north will actually attack the coming Messiah. At that point, Jesus will, with a single utterance, destroy the opposing forces with fire.
In that sense, Jesus will be responding with violence against violence. Why? Probably because the enemy will continue its onslaught if he doesn't stop it.
2 For I will gather all nations against Jerusalem to battle; and the city shall be taken, and the houses rifled, and the women ravished; and half of the city shall go forth into captivity, and the residue of the people shall not be cut off from the city.
3 Then shall the Lord go forth, and fight against those nations, as when he fought in the day of battle.
4 And his feet shall stand in that day upon the mount of Olives....Zechariah 12
And:
21 And I will set my glory among the heathen, and all the heathen shall see my judgment that I have executed, and my hand that I have laid upon them.
22 So the house of Israel shall know that I am the Lord their God from that day and forward.Ezekiel 39
Fire and glory can mean the same thing and in this sense seems to. When the Muslim nations attack Israel, they believe they will be in the right, and they will assume any power coming to save the Jews will be the Dejjal, the Muslim Antichrist, and they will do everything they can to prevent his intervention.