If I had time now to go through the Napoleonic wars from this point of view, I assure you that these simple classic movements which we study here, and which you will come and see us practising in the field, just for the pleasure of a walk, you young rascal⁠—no, I know you’re not well, I apologise!⁠—well, in a war, when you feel behind you the vigilance, the judgment, the profound study of the Higher Command, you are as much moved by them as by the simple lamps of a lighthouse, only a material combustion, but an emanation of the spirit, sweeping through space to warn ships of danger. I may have been wrong, perhaps, in speaking to you only of the literature of war. In reality, as the formation of the soil, the direction of wind and light tell us which way a tree will grow, so the conditions in which a campaign is fought, the features of the country through which you march, prescribe, to a certain extent, and limit the number of the plans among which the general has to choose. Which means that along a mountain range, through a system of valleys, over certain plains, it is almost with the inevitability and the tremendous beauty of an avalanche that you can forecast the line of an army on the march.”