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Map of the frontier between Italy and Austria where the Italians were advancing on June 18, 1915, to capture Trieste. The boxed numbers indicate altitudes in meters.

Italy vs. Austria-Hungary

The Italian Invasion and Italo-Germanic
Differences

Official reviews of the first month, ending June 23, of Italy's war with Austria-Hungary are still lacking.[4] On May 24 it was officially reported in London that Italy had given her adhesion to the agreement, already signed by the allied powers, not to conclude a separate peace. Active war operations were begun by Austria on the same day; bombs were dropped on Venice and five other Adriatic ports, shelled from air and some from sea. The attackers were driven off.

The rapid advance of the Italian armies which invaded Austria on the east had by May 27 carried part of the forces across the Isonzo River to Monfalcone, sixteen miles northwest of Trieste. Another force penetrated further to the north in the Crownland of Goritz and Gradisca. On June 4 the censored news from Udine, Italy, reported that encounters with the enemy thus far had been merely outpost skirmishes, but had allowed Italy to occupy advantageous positions in Austrian territory. The first important battle of the Italian campaign, for the possession of Tolmino, was reported on June 7.

A general Italian advance took place on June 7 across the Isonzo River from Caporetto to the sea, a distance of about forty miles. On June 12 reports from the Trentino indicated an Italian advance on Rovereto in Tyrol, thirteen miles southwest of Trent, and upon Mori, near by. Monfalcone was taken by the Italians on June 10—the first serious blow against Trieste—as Monfalcone is a railway junction and its electrical works operate the light and power of Trieste. In the extreme north, on the threshold of the Carnic Alps, after three days' fighting it was reported on June 10 that the Italians had swept the Austrians from Monte Croce and possessed themselves of Freikofel. The Austrian city of Gradisca was reported taken on June 11, as indicated in an official statement signed by Lieut. Gen. Count Cadorna, Chief of Staff of the Italian Army. The defenses of Goritz were shelled by the Italian artillery on June 13, and on June 14 the Italian eastern army had pushed forward along the Gulf of Trieste toward the town of Nabresina, nine miles from Trieste.