Italian Campaign (World War I)

The Italian campaign was a series of battles fought between Austria-Hungary and Italy in the mountains of northern Italy between 1915 and 1918. 
Italy did not fight for the Triple Alliance, despite promises to Germany and Austria-Hungary, in 1914, when World War I started. In 1915, Italy joined the Triple Entente to take part of Austria-Hungary. Italian irredentism wanted the province of Trento ("Trentino"), the port of Trieste and the province of Bolzano-Bozen ("Alto Adige/Südtirol"), Istria, and Dalmatia.
Italy had hoped to begin the war with a surprise attack to act quickly and capture several Austrian-held cities. However, the war in Italy soon turned to trench warfare, which was similar to that of the Western Front.