A few days later, on July 11, 1916, the Italians exploded a mine, destroying the Austro-Hungarian defenses east of Col dei Bois peak. This position commanded the road of the Dolomites and the explosion blew it up entirely, and gave possession of it to the Italians. The entire Austrian force which occupied the summit was buried in the wreckage. On the following night the Austrians attempted to regain this position which the Italians had fortified strongly in the meantime, but the attack broke down completely. Three days later, July 14, 1916, Italian Alpine detachments surprised and drove the Austrians from their trenches near Castelletto and at the entrance of the Travenanzes Valley. They took some prisoners, including two officers, as well as two guns, two machine guns, one trench mortar and a large quantity of arms and ammunition. An Austrian counterattack against this position was launched on July 15, 1916, but was repulsed. Finally on July 30, 1916, the Italians registered one more success in this region. Some of their Alpine troops carried Porcella Wood and began an advance in the Travenanzes Valley. Throughout this period considerable artillery activity was maintained on both sides. As a result Cortina d'Ampezzo, on the Italian side, suffered a great deal from Austrian shells, while Toblach, on the Austrian, was the equally unfortunate recipient of Italian gunfire. On the western frontier, between Italy and Austria, along Val Camonica, only artillery bombardments were the order of the day. These were particularly severe at various times in the region of the Tonale Pass, but without important results. Aeroplanes, of course, were employed extensively, both by the Austro-Hungarians and the Italians, although the nature of the country did not lend itself as much to this form of modern warfare as in the other theaters of war. Some of these enterprises have already been mentioned. The Austrians, in this respect, were at a decided advantage, because their airships had many objects for attacks in the various cities of the North Italian plain. Among these Bergamo, Brescia, and Padua were the most frequent sufferers, while Italian aeroplanes frequently bombarded Austrian lines of communication and depots. CHAPTER XXXVIII RUSSIAN SUCCESSES AFTER ERZERUM