So far the war had been one unbroken triumph for Germany. She had succeeded even beyond the expectations of her people at home. Fortress after fortress had fallen; victory after victory had been won; the capital of France was at her mercy; prisoners had been captured in huge numbers, and guns by the score. To crown all, just as Sedan Day was approaching and the fall of Paris was hourly expected, the news arrived that von Hindenburg had won an astounding victory at Tannenberg, in Eastern Prussia. The whole German nation went mad with delight. Its wildest ambitions were about to be realized. One short week later there was a sudden and dramatic change in the aspect of affairs. The Allies had made a leap forward; von Kluck, beaten and outflanked, was being harried northward through the woods of Compiègne; von Buelow, with his famous Guards reduced to half their strength, was hurrying towards the Aisne; the Duke of Würtemberg, foiled in his attacks on the French centre, was in sullen retreat; Verdun was still intact; and in Lorraine the Kaiser had seen the White Cuirassiers of Bavaria hurled back in confusion from the French line. The avalanche had fallen, but it had failed to overwhelm the Allied armies. The Germans were now, for the first time, tasting the bitterness of forced retreat. Back they were thrust, but not in rout, to the plateau beyond the Aisne, where, in a position of great strength, they were forced to fight, against all their traditions, on the defensive. For weeks they were besieged, but day by day their entrenchments were strengthened until they resembled fortresses. All the courage and skill and patience of the attackers could not bolt them from these burrows by means of frontal attacks. Then an attempt was made to outflank them by a northward movement of the Allied left. As this movement proceeded, a similar manoeuvre was begun by the foe. Each side attempted to outflank the other, and a feverish race set in for the North Sea, where both flanking movements must perforce end. Three French armies were strung out northwards as far as the La Bassée canal; the British army was transferred from the Aisne to fill the gap beyond; and a new army was collected and hurried to the assistance of the Belgians, who extended the line to the sea. The Allies just won the race, and the Germans found themselves besieged once more, this time on a line of trenches some 450 miles in length. For months to come they strove to break through the Allied lines; with what success future pages of this history will tell.