The basic form of war in the Bible is God's law. God's law declares war on various forms of sin. A theonomic society will be less likely to have military wars because it will identify the main form of sin as in itself. Restitution, the restoration of God's ordained social order, is basic to this dealing with sin in society.
Society is thus in a constant state of war against sin - against internal sin.
When we lose the theonomic perspective, law and the courts begin to go astray. Humanism, man's idea of order, then replaces God's law and order. Today, too much of the world and the church is in rebellion against God. It is amazing that so many churchmen are antinomian. In talking or thinking of war, most people think only of military war.