What is a just war?
It simply means that war might, in certain circumstances, be both politically necessary and morally justifiable. A just war is based on two concepts: jus ad bellum resort to war and jus in bello conduct of war.
Before a just war begins some conditions must be fulfilled:
1. There must be a just cause or right intention. The purpose of a war must be to right a wrong which has been committed (self-defense against unlawful aggression would be considered just), and the ultimate objective must be peace;
2. The use of armed force must always be considered a last resort;
3. The resort to war is the preserve of legitimate authority – an arbitrary act of an individual cannot be considered just;
4. There must be good prospects, no matter what the grievance , if war is likely to be a wasted effort, it should not be undertaken;
5. There should always be a sense of proportion between ends and means. That is the good to be achieved through war must outweigh the damage and harm to be endured (Richard Holmes 2001).