In past wars, the political objective was rarely Total Victory. The glaring exceptions are the Religious Wars with their fanatical, moral overtones. World War I, with its complicated alliances, became bogged down both in the trenches and in the minds of the political leadership. The great legacy of the First World War was the Russian Revolution. Following the Industrial Revolution and the other great scientific advances of man, the Twentieth Century brought the era of Total War. Psychological warfare, economic warfare, and strategic bombing became commonplace. Strategic bombing was probably the most terrible addition made to the conduct of war. The policy of Unconditional Surrender certainly played an important role in World War II. The demand for Unconditional Surrender is basically emotional, displaying a moral approach to war. Rational victory in war is the attainment of specific political objectives at appropriate price or the creation of conditions which enhance the probability of the attainment of political goals.