Whatever was lacking to the situation in natural strength had been supplied by art. This the Russians displayed above all in the Grodek position which, joining the Wereszyca on the north at Janow, stretches for a distance of more than 70 kilometres in a northwestern direction as far as the region of Narol Miasto. Thousands of laborers had here worked for months to construct a fortified position which does honor to the Russian engineers. Here extensive clearings have been made in the forests. Dozens of works for infantry defense, hundreds of kilometres of rifle trenches, covering and connecting trenches, had been dug, the hilly forest land quite transformed, and finally vast wire entanglements stretched along the entire Wereszyca and Grodek front. Taken as a whole this position formed the last great bulwark with which the Russians hoped to check their victorious opponents and to bring their advance upon Lemberg to a permanent halt. The Russian army found itself incapable of acting up to these expectations of its leaders. A cavalry regiment of the Guard, with the cannon and machine guns assigned to it, succeeded on the 16th of June, on the road Jaworow-Niemirow, in making a surprise attack on a Russian infantry brigade marching northward to the Grodek position and in scattering it in the forests. In the evening the city of Niemirow was stormed. On the 18th of June the armies of General von Mackensen deployed into line of battle before the Russian positions. On the following day they moved to the attack. Early in the morning the decisive onslaught was made on the Grodek position and in the evening on the Wereszyca line. Very soon the hostile positions on both sides of the Sosnina forest were taken. Four of the enemy's guns were captured, and the Russian positions on Mt. Horoszyko, which had been built up into a veritable fortress, were stormed.