There was only one German who knew how to deal with the invasion of East Prussia, and he was soon busily occupied. General Hindenburg had a very intimate knowledge of that particular region, founded upon great experience, and had studied in detail the strategic and tactical bearings of this highly restricted field of operations. He had bought large properties in the district, and knew every inch of the ground. He had secretly deepened fords that were marked on the maps and made new ones that were not marked; he had tested the bearing powers of the quagmires and guns and wagons, and he knew just where men and horses might venture and where they would be swallowed up. Some time before the war, when it was suggested that a big land company should be formed to drain the bogs and lakes and turn them into arable farm land, Hindenburg advised the Supreme War Lord not to let the project be carried out. "Those lakes," he said, "are more valuable to us than two army corps. No guns will be needed if the enemy advances. You will see when the day comes." II--HINDENBURG SAT SMILING IN HIS HOUSE And now Hindenburg's army was on one side of these marshes and the Russians were advancing on the other, and Hindenburg sat smiling in his house, like a spider in its web, stroking his moustache self-complacently. The Huns did not trouble much about the advancing troops, for Hindenburg merely said, "Let them come," and smiled again. The events that followed were some of the most tragic of the war. Hindenburg watched the results of his calculations surrounded by the _Hochgeboren_--the princes and generals of the army of the Huns. Can it be wondered that the Duke of Brunswick, who witnessed the tragedy, has since been reported as hopelessly insane? At the age of nine-and twenty he was in command of the German troops at the Russian frontier, and saw the terrible fate of the men who were swallowed up bodily in the treacherous marshes. The cries of the victims and his own helplessness haunted him to such an extent that it is said he lost his reason and, from extreme violence, drifted into a deep stupor of melancholy. Mooska Zarden was among those who witnessed the terrors of that awful day. Finding the ground soft and muddy, the Russian engineers were sent forward with long planks to make a roadway for the troops to pass over the marshes, little thinking that, owing to the treacherous nature of the ground, the black slime and ooze would soon suck down into the bottomless mire the flower of Russian manhood, and that even the roadway itself would be swallowed up.