The fighting around Vilna was the bitterest in the whole long retreat. On the 18th of September it fell, but the Russian troops were safely removed and the Russian resistance had become strong. Munitions were pouring into the new Russian army. The news from the battle-front began to show improvement. On September 8th General Brussilov, further in the south, had attacked the Germans in front of Tarnopol, and defeated them with heavy loss. More than seventeen thousand men were captured with much artillery. Soon the news came of other advances. Dubno was retaken and Lutsk. The end of September saw the German advance definitely checked. The Russian forces were now extended in a line from Riga on the north, along the river Dvina, down to Dvinsk. Then turning to the east along the river, it again turned south and so on down east of the Pripet Marshes, it followed an almost straight line to the southern frontier. Its two strongest points were Riga, on the Gulf of Riga, which lay under the protection of the guns of the fleet, and Dvinsk, through which ran the great Petrograd Railway line. Against these two points von Hindenburg directed his attack. And now, for the first time in many months, he met with complete failure. The German fleet attempted to assist him on the Gulf of Riga, but was defeated by the Russian Baltic fleet with heavy losses. A bombardment turned out a failure and the German armies were compelled to retire. A more serious effort was made against Dvinsk but was equally unsuccessful and the German losses were immense. Again and again the attempt was made to cross the Dvina River, but without success; the German invasion was definitely stopped. By the end of October there was complete stagnation in the northern sector of the battle line, and though in November there were a number of battles, nothing happened of great importance. [Illustration: THE GERMAN ATTACK ON THE ROAD TO PETROGRAD] Further south, however, Russia had become active. An army had been organized at her Black Sea bases, and for political reasons it was necessary that that army should move. At this time the great question was, what was Roumania about to do? To prevent her from being forced to join the Central Powers she must have encouragement. It was determined therefore that an offensive should be made in the direction of Czernowitz. This town was the railway center of a wide region, and lay close to Roumania’s northern frontier.