The Germans immediately turned the metal-working plants of the city to their uses in the manufacture of chains, barbed wire, etc. They also found here a large supply of tools for intrenching work. Most of the Russians of the city had fled. One motive for the German advance into Courland advanced by their enemies was that it was an attempt to include a rich section of country in foraging operations, and it is a fact that the German authorities gave expression to their satisfaction at seizing a region that was of considerable economic value. It is apparent, however, in regarding these operations in the retrospect that they had no small bearing on the German plan of campaign as a whole. It was at the time that the inroad into Courland was started that the signal was about to be given for the great onslaught far to the south on the Dunajec, as described in the account of the Austro-Russian campaign. As the vast campaign along the whole eastern front developed, it became more and more apparent that the position of the German troops in Courland placed them advantageously for taking the Russian line of defenses, of which the fortress of Kovno represented the northern end in the flank in this carrying out of an important part of the vast encircling movement which took all Poland in its grasp. They were a constant threat to the all-important Vilna-Petrograd Railway. In hostile and neutral countries the Courland invasion provoked comment indicating astonishment at the resources of the Teutonic powers in being able to extend their lines while already fully engaged on an enormous front. The Russians, awakening from their first astonishment, made vigorous attempts to obtain permanent possession of the Dubissa line. Along this line the German troops were for a time forced to yield ground and to go into the defensive and to resist heavy Russian attacks. Shavli was given up under Russian pressure. By May 14, all the territory east of the Dubissa and Windau (Vindowa) was reported free of Germans. Especially noteworthy among the struggles for the Dubissa was the fight at Rossiennie, a town which was of special importance because of its command of the roads centering in it. On the 22d of May, 1915, an attack was delivered against this place by the First Caucasian Rifle Brigade with artillery and assisted by the Fifteenth Cavalry Division. On the 23d the German cavalry which had resisted their crossing the river drew back, and the Russians here crossed the Dubissa, approaching Rossiennie from the north. The Germans during the night moved the greater part of their troops around the western wing of their opponents and placed them in position for attack.