The Austrian concentration of artillery fire, in which guns of all caliber were employed, lasted uninterruptedly throughout the day, forcing the Italians to evacuate the positions during the course of the night. The Fella sector of the Carinthian front and also the Col di Lana sector in the Tyrol were shelled by Italian artillery. Italian airmen dropped bombs on Trieste without doing any damage. Again atmospheric conditions enforced a lull in military operations during the next few days and brought to a sudden end what had seemed to be an extensive offensive movement on the part of the Italian forces on the Isonzo front. On March 17, 1916, however, violent fighting again developed on the Isonzo front in the region of the Tolmino bridgehead. It began with greatly increased artillery activity along the entire sector between Tolmino and Flitsch. Later that day the Austro-Hungarians launched an attack against the Italian forces which netted them considerable ground on the northern part of the bridgehead, as well as some 500 prisoners. The battle in the Tolmino sector continued on March 18 and 19, 1916, and to a slighter degree on March 20, 1916. On the first of these three days the Austro-Hungarian troops succeeded in advancing beyond the road between Celo and Ciginj and to the west of the St. Maria Mountain. Italian counterattacks failed. South of the Mrzli, too, the Italians lost a position and had to withdraw toward Gabrije, losing some 300 prisoners. Increased artillery activity was noticeable on the Carinthian front, particularly in the Fella sector; in the Dolomites, especially in the Col di Lana sector; in the Sugana Valley and at some points on the west Tyrol front. Goritz, too, was again subjected to heavy Italian gunfire. On the following day, March 19, 1916, fighting continued at the Tolmino bridgehead as a result of Italian efforts to conquer positions firmly in Austro-Hungarian hands. The number of Italians captured reached 925 and the number of machine guns taken was increased to seven. Several Italian attacks against Mrzli and Krn (Monte Nero) broke down. On the Rombon the Austro-Hungarians captured a position and took 145 Italians and two machine guns. Lively fighting continued on the Carinthian front. In the Tyrol frontier district Italian artillery again held the Col di Lana section and some points south of the front under heavy artillery fire. On the Goritz bridgehead Austro-Hungarians in the morning set fire to an Italian position before the southern part of Podgora Height. In the afternoon Austro-Hungarian artillery shelled heavily the front before the bridgehead. During the night they ejected Italian forces from a trench before Bevma. Again on March 20, 1916, Italian counterattacks against the positions captured by the Austro-Hungarians during the preceding days failed. Again fighting slowed down for a few days. As usual, resumption of military operations was indicated by increased artillery fire.