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.