Paul shows that governments have a right to use the sword to prevent bad, and that we should be in subjection to what they demand of us. This includes going to war when called for.
Romans 13:1-4 "Let every soul be in subjection to the superior authorities, for there is no authority except by God; the existing authorities stand placed in their relative positions by God. Therefore he who opposes the authority has taken a stand against the arrangement of God; those who have taken a stand against it will receive judgment to themselves. For those ruling are an object of fear, not to the good deed, but to the bad. Do you, then, want to have no fear of the authority? Keep doing good, and you will have praise from it; for it is God's minister to you for your good. But if you are doing what is bad, be in fear: for it is not without purpose that it bears the sword; for it is God's minister, an avenger to express wrath upon the one practicing what is bad."
Russell recognised that this scripture required early Witnesses to engage in civilian service and even attend the front line.
"The early Bible Students took this scripture to mean that if a Christian was drafted in wartime, he would be obligated to put on a uniform, shoulder a gun, and go to the front, to the trenches. It was felt that since a Christian could not kill a fellow human, he would be compelled to fire his gun into the air if worst came to worst." Watchtower 1995 May 15 pp.21-22