Italy's declaration of war against Austria-Hungary marked a significant turning point in World War I. Historically bound by the Triple Alliance with Germany and Austria-Hungary, Italy faced complex national interests and strategic considerations. Discontent with the Austro-Hungarian Empire's political dominance and inspired by promises of territorial gains through the Treaty of London, Italy shifted its allegiances to the Allies. This shift was motivated by not only national pride but a desire to reclaim territories such as South Tyrol, Trentino, and parts of the Adriatic coast that were populated by Italians. The declaration was formalized on May 24, 1915, when Italian Prime Minister Antonio Salandra announced Italy's entry into the war against Austria-Hungary. The decision had immediate ramifications, as it initiated a series of military campaigns known as the Italian Front, primarily fought in the mountainous regions of Northern Italy. Italian forces faced numerous challenges, including harsh conditions, well-fortified enemy positions, and internal strife within the military. The early engagements, such as the Battle of Caporetto, would greatly affect Italian morale and strategy. Italy's involvement in the war was thus a product of both internal ambitions and external pressures. Significant battles and campaigns characterized the Italian front, shaping both Italy's military reputation and its post-war territorial settlements. The nature of Italy's participation also highlighted the fragmented political landscape in Europe, as alliances constantly shifted in response to the ongoing conflict. The eventual resolution of the war, culminating in the Treaty of Versailles, would lead to Italy acquiring some territorial aspirations, but economic strain and military losses would leave a lasting impact on the nation’s political landscape in the years that followed.