God Ordained War (outside of the OT)

Romans 13:1-6-Everyone must submit himself to the governing authorities, for there is no authority except that which God has established. The authorities that exist have been established by God. 2 Consequently, he who rebels against the authority is rebelling against what God has instituted, and those who do so will bring judgment on themselves. 3 For rulers hold no terror for those who do right, but for those who do wrong. Do you want to be free from fear of the one in authority? Then do what is right and he will commend you. 4 For he is God’s servant to do you good. But if you do wrong, be afraid, for he does not bear the sword for nothing. He is God’s servant, an agent of wrath to bring punishment on the wrongdoer. 5 Therefore, it is necessary to submit to the authorities, not only because of possible punishment but also because of conscience. 6 This is also why you pay taxes, for the authorities are God’s servants, who give their full time to governing. 7 Give everyone what you owe him: If you owe taxes, pay taxes; if revenue, then revenue; if respect, then respect; if honor, then honor.

Revelation 19:11-21-I saw heaven standing open and there before me was a white horse, whose rider is called Faithful and True. With justice he judges and makes war. 12 His eyes are like blazing fire, and on his head are many crowns. He has a name written on him that no one knows but he himself. 13 He is dressed in a robe dipped in blood, and his name is the Word of God. 14 The armies of heaven were following him, riding on white horses and dressed in fine linen, white and clean. 15 Out of his mouth comes a sharp sword with which to strike down the nations. “He will rule them with an iron scepter.” He treads the winepress of the fury of the wrath of God Almighty. 16 On his robe and on his thigh he has this name written:
KING OF KINGS AND LORD OF LORDS.
17 And I saw an angel standing in the sun, who cried in a loud voice to all the birds flying in midair, “Come, gather together for the great supper of God, 18 so that you may eat the flesh of kings, generals, and mighty men, of horses and their riders, and the flesh of all people, free and slave, small and great.”
19 Then I saw the beast and the kings of the earth and their armies gathered together to make war against the rider on the horse and his army. 20 But the beast was captured, and with him the false prophet who had performed the miraculous signs on his behalf. With these signs he had deluded those who had received the mark of the beast and worshiped his image. The two of them were thrown alive into the fiery lake of burning sulfur. 21 The rest of them were killed with the sword that came out of the mouth of the rider on the horse, and all the birds gorged themselves on their flesh.

If these passages are taken separately they may produce interpretations which may lead to a pacifist conclusion, however together I would argue that they point in yet another direction. In Revelation we see that Jesus Christ himself is leading an army to war (the apocalyptic language does not draw a perfect picture of exactly how this is going to take place, however it can safely be argued that the idea here is one of war). Therefore, it must be permissible for Christians to participate in war, at least with Christ. If it were not for the Romans passage, I may agree that this participation is only permissible when being lead by Christ, however the Romans passage does exist. In Romans, the state (governing authorities) is given not just the authority but the mandate to go to war in order to bring about justice. Also in this passage Christians are commanded to be submissive to the state. It is possible that this submission would include participating in war. When these two passages are put side by side it becomes clear that God not only allows war but that in some instances he ordains war. If God ordains war, and ordains the state to carry out war, I do not see a problem with a Christian, in allegiance to Christ, submitting to the state and joining in war to bring about justice.