What is war? The dictionary will say that is a state of armed conflict. But what is an armed conflict? Well, conflict is a serious disagreement. And armed means someone that carry weapons. So, in the end, war is a state where two or more e groups that have weapons are in a serious disagreement. Notice that it does not mean they are fighting each other (that is known as a battle), just that they really don’t agree with each other for some reason. Two soccer teams seriously disagreeing to each other and using violence in a game is not a war, since they are not armed. But cops and drug dealer not agreeing about drug sales, well that can be a war. But when a disagreement turns into a serious disagreement? That’s harder to define. What is the line that divides a disagreement from a serious disagreement?
Perhaps the best way is to define what is not a war? if there is no disagreement, then clearly it is not a war. There is a name for that, it is called cooperation. Cooperation means two groups are working together for some reason. Perhaps they don’t see it as equally beneficial, but at least they see enough benefit on it to work together. And that’s enough. There is a name for the mutually beneficial agreements and exchange between two groups. It is called Peace.
But what if there is no peace among two armed groups? They can start by talking to each other and trying to create a new agreement. This is called diplomacy and it is the last step to keep peace. If that fails, there is a disagreement, a conflict. A group may threat the other with words and actions that can hurt them and coerce the group to a new agreement. How aggressive and violent are the actions depends on the situation. Whatever it is, this is not peace anymore. Perhaps the best way to define war is when two armed groups are not at peace.
How can one stop war? The best shot is, of course, diplomacy. If the armed groups can talk with each other to create a new beneficial agreement, then peace can persist. But if that is not possible, or in the minds of one of the sides not acceptable, then how to give no other option to a group besides diplomacy? It is to make all the other options so bad, with so little to gain, that one would never choose it.
How can one make diplomacy to be the only option? By making any attempt to not use diplomacy doomed to fail. In other words, if one is so much better at winning serious disagreements which actions instead of words, then it makes no sense to use anything else besides words. That means, one must be good at all those things an group with weapons can do to the point that others are not willing to try. To be so good at use those weapons, that it makes no sense to try to win with weapons.
So if one wants peace, they must make any options besides peace to be unthinkable. To be so prepared to win all options besides peace that any other group would not consider to create an agreement in any other ways but in a peaceful manner. In other words, if one wants peace, be prepared for war.