In the morning of August 19, 1917, after a twenty-four hours' bombardment, during which Italian artillery shelled the Austrian positions with ever-increasing intensity, the masses of Italian infantry commenced the advance toward their objectives. From Plava, between Anhovo and Goritz, as far as the sea, after having crossed the Austrian first line, which was completely destroyed, Italian troops brought pressure to bear upon the Austrians, who, resisting strongly and being supported by considerable artillery and a large number of machine guns, offered a desperate resistance. Altogether 208 Italian aeroplanes participated in the battle, attacking repeatedly with bombs and machine guns the troops assembled to the rear of Austrian positions. The enemy's losses were very serious. The booty, even during the first day, was very considerable. Some guns and a large number of machine guns were taken by the Italians and more than 7,500 men and about 100 officers had passed into Italian collecting stations by the end of the first evening. During the next few days severe fighting continued. By the evening of August 20, 1917, the number of Austrians taken by the Italians had increased to over 10,000 men and about 250 officers. On the night of August 19-20, 1917, the Austrians attempted a diversion by concentrating fire and carrying out local attacks at various points on the Trentino and Carnia fronts. They were everywhere repulsed. One of their storming parties was destroyed in the Lagarina Valley, and another which had succeeded in gaining a foothold in one of the Italian advance posts southeast of Monte Maio was driven back by a prompt counterattack. During August 19, 1917, cooperating with the advance of the army, floating batteries of the Italian navy and British and Italian monitors effectively bombarded the Austrian positions and communications on the lower Isonzo. Simultaneously Italian monitors were bombarding the Austrian dockyards south of Trieste. Austrian batteries replied vigorously, but the Allies' units were entirely unharmed. At nightfall they were attacked unsuccessfully by Austrian aeroplanes. One of these was brought down by antiaircraft guns and captured in the Grado Lagoon, mouth of the Isonzo. During the continuation of the fighting in the northern part of the line, the Austrian lines on the Carso Plateau and on the coastal zone began to bend and give way at various points. Italian forces succeeded in carrying the well-organized Austrian defenses between Korite and Selo, near the strongly fortified position of Stari Lokva. During the night of August 24, 1917, the Austrians evacuated Monte Santo, which, soon afterward, was occupied by Italian forces. By August 25, 1917, the number of prisoners taken amounted to more than 600 officers and 23,000 men. The number of guns captured had risen to seventy-five, including two 305-millimeter, (twelve inches) mortars and many guns of medium caliber.