So it is that when any great event occurs, when on a distant frontier an army is in jeopardy, or defeated, or victorious, the vague and conflicting reports which we receive, from which an educated man can derive little enlightenment, stimulate in the crowd an emotion by which that man is surprised, and in which, once expert criticism has informed him of the actual military situation, he recognises the popular perception of that "aura" which surrounds momentous happenings, and which may be visible hundreds of miles away.