VIENNA, June 18, (via London.)—The Austro-German troops in pursuit of the retreating Russians have crossed the Galician border to the north of Sieniawa and occupied the Russian town of Tarnogrod, according to an official communication issued by the War Office tonight. The communication says:

North of Sieniawa our pursuing troops have penetrated Russian territory and reached the heights north of Krezow and occupied Tarnogrod.

The Russian forces between the Lower San and the Vistula have retired at several points. The heights north of Cieszanow (ten miles north of Lubaczow) have been taken. In the mountainous region east of Niemirow and in the rear of Jaworow, strong Russian forces have appeared.

On the Wereszyca River the fighting continues. Our troops have gained a footing at some points eastward of the river.

South of the Upper Dniester the Russians, after hard fighting, were compelled to retire from positions near Litynia toward Kolodrub. Our pursuing troops have reached the mouth of the Wereszyca. Elsewhere the situation along the Dniester is unchanged.

[[Enlarge]]

The dotted line shows the approximate position of the Austro-German battle line in the middle of February, when the drive at Lemberg, supported with enormous reinforcements which had been concentrated at Cracow, began. The heavy black line shows the approximate position of the victorious armies bent on driving the Russians out of the corner of Galicia still remaining in their possession. The frontier is indicated by the line of dots and dashes.

The eastern groups of General Pflanzer's army yesterday repulsed three Russian storming attacks. The enemy making desperate attempts to throw our troops back in Bukowina, suffered heavy losses from our artillery and retired quickly. Eight officers and 1,000 men and three machine guns were captured.

GRODEK POSITION CAPTURED.