The army of General von Gallwitz proceeded against the Russian positions in the district south and southeast of Olawa. After a brilliant attack three Russian lines, situated behind each other northwest and northeast of Przasnysz, were pierced. Dzielin was captured and Lipa was reached and attacked by pressure exerted from both these directions. The Russians retreated, after the evacuation of Przasnysz on the 14th, to their line of defense from Ciechanow to Krasnosielo, lying behind them. On the 15th German troops also took these enemy positions by storm, and pierced the position south of Zielona, over a front of seven kilometers, forcing their opponents to retreat. They were supported by troops under General von Scholtz, which are occupied with a pursuit from the direction of Kolno. Since yesterday the Russians have been retreating on the center front, between the Pissa and Vistula Rivers, in the direction of Narew. Southeastern Theatre of War.--After the Teutonic allies had taken during the last few days a series of Russian positions on the River Bug and between the Bug and the Vistula, important battles developed yesterday on this entire front under the leadership of Field Marshal von Mackensen. West of the Vierpz, in the district southwest of Krasnostav, German troops broke through the enemy's line. So far 28 officers and 6,380 men have fallen into our hands, and 9 machine guns have been captured. West of the Upper Vistula the offensive has again been begun by the army of General von Woyrich. _An official statement issued by general headquarters in Vienna on July 18 says:_ On the Bug River, in the region of Sokol, our troops drove the enemy from a series of stubbornly defended places. To the northeast of Sienvno we broke through the Russian front. The enemy is evacuating his positions between the Vistula and the Kielce-Radom Railway. _An earlier bulletin, dated July 17, read as follows:_ Between the Vistula and the Bug Rivers important battles have developed favorably for the allied troops. Some Austro-Hungarians, operating closely with the Germans west of Grabovetz, took an important enemy point of support after storming it several times, and pressed forward into the enemy's main position. Southwest of Krasnostav the Germans broke through the enemy's lines. On the Upper Bystrcz and north of Krasnik our troops took advanced positions of the enemy. The offensive also was resumed successfully west of the Vistula. BERLIN'S REJOICING _An Associated Press dispatch from Berlin via London on July 18 said:_ The news of Field Marshal von Hindenburg's newest surprise for the Russians, which the War Office announces has resulted in important victories, was made known late yesterday, causing general rejoicing and the appearance of flags all over the city.