In spite of this the Russians attempted local advance on April 13, 1916, in the region of Garbunovka, northwest of Dvinsk and south of Lake Narotch; however, though their losses were quite heavy, they could not gain any ground. This was also true of another local attack made against the army of Prince Leopold of Bavaria near Zirin, on the Servetsch River northeast of Baranovitchy. Similarly unsuccessful were German attacks made the same day between Lakes Sventen and Itzen. German artillery still kept up its work along the entire front, especially at Lake Miadziol, south of Dvinsk at Lake Narotch, and at Smorgon, the little railroad station south of the Viliya River on the Vilna-Minsk railway. On the following day, April 14, 1916, the Russians repeated their efforts in the Servetsch region. After strong artillery preparation they launched another attack near Zirin, and southeast of Kovelitchy, but were again repulsed. The same fate was suffered by an attack attempted northwest of Dvinsk. South of Garbunovka, however, they registered a slight local success. After cutting down four lines of barbed-wire obstacles that had been erected by the Germans, they stormed and occupied two small hills west and south of this village. This gain was maintained in the face of strongly concentrated artillery and rifle fire, and repeated German counterattacks, which later proved very sanguinary to the German troops. German artillery again directed violent fire against the Russian positions between Lake Narotch and Lake Miadziol and near Smorgon. A German attack made northwest of the latter village broke down under Russian gunfire. At this point the Germans resumed their offensive at daybreak on April 15, 1916, after strong artillery preparation accompanied by the use of asphyxiating gas. Concentrated fire from the Russian artillery, however, prohibited any noticeable advance. During the following day, April 16, 1916, both sides restricted themselves more or less to artillery bombardments, which became especially violent on the Dvina line, around the Uxkull bridgehead, and in the neighborhood of the Russian positions south of the village of Garbunovka, as well as between Lake Narotch and Lake Miadziol. Two days later, on April 18, 1916, German detachments temporarily regained some of the ground lost about a week before south of Garbunovka. Again on that day the guns on both sides roared along the entire northern sector of the eastern front. On the 19th the bombardment became especially intense at the bridgehead at Uxkull and south of lake.