"But, boys, the three years before that campaign had been three years of eruptions. St. George, in the West Indies, erupted in 1810; Etna, the great volcano of Sicily, had an eruption in 1811; and La Soufriere, which broke loose again in your lifetime, boys, erupted in 1812. As a result, the upper air was full of dust, and the middle air was even more filled, for while these eruptions were not as powerful as Asama and Krakatoa, there had been a continual replenishment of the stores of volcanic dust. "So Napoleon and his army started off. The great march into Russia began with an army of four hundred and fifty thousand men, in torrid summer heat. The crops were still green, for the spring had been late and the summer most unseasonable. As a result, there was not enough food for the horses and terrible epidemics of disease broke out among them. Napoleon was always especially strong in cavalry, over eighty thousand of his troops being mounted. When, to this, is added the twenty thousand horses needed for officers and for the artillery, it is easy to see that the lack of forage seriously handicapped the army. It is by no means easy to feed a hundred thousand horses. Before the army had advanced more than ten days' march, one-fourth of the horses had died. "The Russians, thoroughly realizing that their strongest ally was Distance, retreated, without giving battle. Napoleon's army marched on. The Cossacks, with their well fed horses, constantly circled round the French army and cut to pieces the small detachments in the van and in the rear-guard. The French cavalry, with their horses dead, dying or out of condition, could not pursue. Meanwhile the army, under the burning heat of the short summer which had known no spring, marched on. "Into that huge wilderness, over the marshes and plains, the army marched. Always before it lay a land bare and dumb. The vast Russian army could never be found. In endless succession the French crossed plains on which the grass grew, thin and bare, splendid for the grazing of cattle, but utterly insufficient for a hundred thousand horses, now reduced to seventy thousand. Ahead of the soldiers, every day, the sun rose red upon an empty land, every night it set, red, behind them, upon a land equally bare and empty. Day after day they marched through this land without food, unmolested by the Russians, who knew well that lack of forage and interminable marching was defeating the great Napoleon better than they could upon the battlefield, and without the sacrifice of a single Russian soldier. Weather, boys, always weather, is the greatest ally or the greatest enemy in the entire history of war.