The First World War fundamentally reshaped Europe and the modern world between 1914-1918, marking one of history's most devastating conflicts.
Italy entered the war in 1915 after initially remaining neutral, breaking its alliance with the Central Powers to join the Allied forces. The Italian Front became a crucial battleground, particularly along the Isonzo River where Italian forces faced off against Austro-Hungarian troops in a series of bloody battles. The challenging Alpine terrain made combat especially difficult, with soldiers fighting not only the enemy but also the harsh mountain conditions. Key battles included Caporetto in 1917, where Italian forces suffered a major defeat, and the decisive victory at Vittorio Veneto in 1918 that helped secure Allied victory.
The war was fought across multiple fronts, with the Western Front in France and Belgium seeing some of the deadliest trench warfare in history. The Eastern Front stretched from the Baltic Sea to the Black Sea, where Russian forces battled German and Austro-Hungarian armies. The war introduced new military technologies including tanks, aircraft, and chemical weapons, forever changing how conflicts would be fought. The Allied Powers (including Britain, France, Russia, and later the United States) ultimately prevailed over the Central Powers (Germany, Austria-Hungary, Ottoman Empire) in 1918. The aftermath led to the collapse of four empires - German, Austro-Hungarian, Ottoman, and Russian - and redrew the map of Europe through the Treaty of Versailles. The war's impact extended far beyond the battlefield, triggering social changes like women's suffrage movements and new political ideologies that would shape the 20th century. The conflict's unresolved tensions and harsh peace terms would later contribute to the outbreak of World War II two decades later.