The causes of war anywhere in the international system are as illogical as the passion involved in executing the war. There are various reasons why war occurs and these reasons, whatever they are, provide parties involved in war the justification for warfare. The paper argues that war is preventable if only humanity could control the influence of pride, ego, and the use of aggression. The article uses ancient wars in Esanland of Nigeria as bases to argue that the reasons why nations go to war in contemporary international politics are basically attributable to weaknesses in human nature. “War is the greatest of all crimes, and yet there is no aggressor who does not colo[u]r his crime with the pretext of justice.”