Von Hindenburg had taken a position astride the railway from Allenstein to Soldau, and all access to his front was barred by lakes and swamps. He was safe from frontal attack, and could reinforce each wing at pleasure. From his right ran the only two good roads in the region, and at his left was the Osterode railway. On the first day he stood on the defensive, while the Russians, confident of victory, attacked again and again. Some ground was won and prisoners captured, and the news of a second victory was sent to western Europe. The battle continued, however, until the last day of August and is known as the battle of Tannenberg, from a village of that name near the marshes. Having worn down his enemy, von Hindenburg counter-attacked. His first movement was on his right. This not only deceived Samsonov and led him to reinforce his left, but also enabled von Hindenburg to seize the only good road that would give the Russian army a chance of retreat. Meanwhile the German general was hurrying masses of troops northeastward to outflank the Russian right. While the Russians were reinforcing one flank, he was concentrating every man he could upon the other. Then his left swept southward, driving in and enveloping the Russian right, and Samsonov was driven into a country full of swamps and almost without roads. To thoroughly understand the plight of the Russian army one must have some idea of the character of the Masurian Lake district. It was probably molded by the work of ice in the past. Great glaciers, in their progress toward the sea, have ground out hundreds of hollows, where are found small pools and considerable lakes. From these glaciers have been dropped patches of clay which hold the waters in wide extents of marsh and bog. The country presents a monotonous picture of low, rounded swells and flats, interspersed with stunted pine and birch woods. The marshes and the lakes form a labyrinth, difficult to pass even to those familiar with the country. The Masurian region is a great trap for any commander who has not had unlimited acquaintance with the place. Causeways, filled with great care, and railroads permit an orderly advance, but in a confused retreat disaster at once threatens. This was the ground that von Hindenburg knew so well. The Russians resisted desperately, but their position could not be held. Disaster awaited them. They found their guns sinking to the axle-trees in mire. Whole regiments were driven into the lakes and drowned. On the last day of battle, August 31st, Samsonov himself was killed, and his army completely destroyed. Fifty thousand prisoners were taken with hundreds of guns and quantities of supplies. Von Hindenburg had attained the triumph of which he had so long dreamed. It was an immensely successful example of that enveloping movement characteristic of German warfare, a victory recalling the battle of Sedan, and it was upon a scale not inferior to that battle.