The doctrine of a just war was developed during the 2nd half of the first millennium; it sought to establish reasons why a nation might be justified in going to war. The Catechism of the Catholic Church is quite clear on the issue in the following paragraphs: 2307 "The fifth commandment forbids the intentional destruction of human life. Because of the evils and injustices that accompany all war, the Church insistently urges everyone to prayer and to action so that the divine Goodness may free us from the ancient bondage of war." 2308: All citizens and all governments are obliged to work for the avoidance of war. However, "as long as the danger of war persists and there is no international authority with the necessary competence and power, governments cannot be denied the right of lawful self-defense, once all peace efforts have failed." 2309, The strict conditions for legitimate defense by military force require rigorous consideration. The gravity of such a decision makes it subject to rigorous conditions of moral legitimacy. At one and the same time: * the damage inflicted by the aggressor on the nation or community of nations must be lasting, grave, and certain; * all other means of putting an end to it must have been shown to be impractical or ineffective; * there must be serious prospects of success; * the use of arms must not produce evils and disorders graver than the evil to be eliminated. The power of modern means of destruction weighs very heavily in evaluating this condition.
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Just warfare is war that has fair and appropriate aimes and is prosecuted in compliance with the laws of war that were developed by the Europeans during the last several centuries and codified in the Geneva Conventions. Many people believe that World War 2 was a Just War because it was waged Japan and dictatorships in Germany and Italy, who were invading other countries and inflicting massive death and injuries on non-combatant populations. Similarly, the First Gulf War, waged to force Iraq out of Kuwait, was considered by many to be a Just War. The problem is that most countries engaged in war claim to be waging Just War. Their opponents always disagree and often third party observers may disagree.
In Catholic theology there is that concept. Self defense for the survival of a people might be considered one. Oscar Romero believed that the Salvadoran revolutionary movement was a just war.
All wars are just according to the initiator. It's the winner of the war who judged their war just..
The idea of a "just war" is to place moral restraints on warfare by establishing criteria for determining when and how to wage war justly.
Biological warfare.
trench warfare
Maneuver warfare is highly mobile warfare such as a tank battle.
trench warfare chemical warfare
World War 1 introduced aerial warfare with airplanes and trench warfare