In the meantime, while Russky was thus pounding at Von Auffenberg's right, Brussilov was attacking his right and center. Having crossed the frontier between Brody and Sokal, Russky extended his forces on a wide front. While the center advanced straight for Busk and Krasne in a direct line toward Lemberg, the right, proceeding almost due west, was attempting to penetrate between the army of Von Auffenberg and that of Dankl on the north, and was pushing powerfully on Von Auffenberg's left. Gallantly resisting, the Austrians were forced back in all directions, slowly but firmly. The fighting on Russky's right and center was especially fierce and severe and resulted in great losses on both sides. By the time Brussilov had taken the position on the Zlota Lipa, his right was in touch with Russky's left, and the first stage of the campaign was over. That Russia had been able to proceed so far with her plans would seem to indicate that the Austrians had underestimated the rapidity with which she could complete her preparations. It was the fall of Tarnopol that made possible a junction of the Russian armies and enabled them to advance in a united line upon Lemberg. General Brussilov had to move to the attack without attracting attention. This was accomplished by both Russky and himself throwing out a screen of Cossacks all along the frontier of Eastern Galicia. For an extent of one hundred and fifty miles, the Cossacks skirmished at every border road or bridge between the Bug and the Dniester rivers. They started this immediately after war was declared and soon, so inconsequential did such activity appear, that the Austrians, it seems, came to regard it as lacking any real purpose. After the third week in August, however, the commander at Lemberg sent a force of 2,000 men to make a reconnaissance in Podolia. These troops arrived at Gorodok, a small town across the border. Their presence there was most inconvenient for the Russians, for General Brussilov was at that time advancing with a big army through Gorodok on toward Galicia. It was imperative that the Austrian reconnoitering troops should be stopped and the only force available for this purpose was nine hundred Cossacks stationed at Gorodok to screen the main army. It was necessary for these Cossacks to repulse the Austrian reconnoitering force, without calling for large reenforcements. If the latter were done, it would excite the suspicions of fugitives from the fight. Therefore, the Cossacks lined out in the woods far beyond the village and then thirty of them went forward from cover to cover until they came upon the Austrians. Simulating surprise, they fled in apparent panic. The Austrians entered upon a swift pursuit and were led into ambush. Thousands of them were cut down by a cross-fire of rifles and machine guns. The rest were pursued by Cossacks over the border and the invasion of Galicia was begun by the Russian main force.