The campaign began with scattered Italian offensives all along the northern frontier, designed to wrest from the Austrians their control of the Alpine heights and passes, and to secure the flank of the main attack across the Isonzo towards Trieste. Slight successes were gained at various points, and the enemy was pressed back almost to the head of Lake Garda. But no serious impression was made on his positions except along the lower reaches of the Isonzo. Here the west bank from Tolmino down to Monfalcone and the sea fell into Italian hands. Gradisca was captured on 10 June and the river was crossed at different points. On the 20th the Italians announced their firm establishment on the slopes of Monte Nero above Tolmino and Caporetto, and on 26 July a similar success on Monte San Michele and Monte dei Sei Busi farther south near Gorizia. On 4 August they were even said to be making progress on the Carso to the south-east. But all these gains were illusory. Gorizia itself remained in Austrian hands for another year, the heights east of it were not mastered until 1917, and neither Tolmino nor the Carso fell to the Italians until the war had been lost and won. There was nothing here to disturb the Austrian concentration of effort against their Russian foes or to call for German assistance to their Austrian allies. Italy did, however, on 20 August declare war upon Turkey, with which she had not yet made a definitive peace since the outbreak of hostilities in 1911; and it was even announced that she would send an expedition to the Eastern Mediterranean. This was taken to mean a descent upon Adalia in Asia Minor, where Italy desired to stake out her claims in the expectation of an early dissolution of the Turkish Empire. But the Turks showed unexpected signs of animation under German stimulants, and the "eastern Mediterranean" expedition was reduced to the nearer and more practical exploit of seizing Avlona which there were not even Turkish troops to defend. Italy was not alone to blame, for the first use the Serbs made of Italy's committal to the Entente cause was to dash across to the Adriatic coast where their rival claims conflicted.