Just war defines war as a situation where parties have to fight back based on various conditions. This includes having a just cause. This means that parties need to have just reasons for going to war. (DeForrest, 1997)
Throughout history, human beings have continued to engage in war at different times for different reasons. Human beings have used war as a method of solving conflicts, yet, at the same time, war has been condemned by human beings as unnecessary. Accordingly, though the war has been a continued to be part of human history, human beings have always tried to reduce the extent of war by which the war may be fought. (DeForrest, 1997)
Over the past, the question of when is war "justified" and which methods are suitable for a war has raised a vast deal of assessment. The great examination of the question has lead to the concept of just war to try and explain the when military action is justified. Just war theory has been accepted in many countries as the way in which just war may be determined.
According to Wells (1996) he argues that war is justified if it is fought in reaction to aggression. The aggression can be directed to another state or towards a region of another state, threatening the political independence of that particular state.
Despite the diverse sources in the formulation of just war theory, it basically has two basic major issues in regard to legitimizing a war. The first basic issue termed as "jus ad bellum" a Latin term meaning right or just to resort to war, which relates to when it is proper to get engaged in war. The second fundamental issue, jus de Bello determines the justified methods of warfare within a war.