Thanks To The Treaty Of Vienna
In 1866, both sides signed the Treaty of Vienna and enjoyed relative peace for quite some time. As a matter of fact, they had even been allies during the outbreak of hostilities in July 1914. As the complex conflict spread across the region, however, old tensions between the two started to surface once more.
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After The Treaty Of London
In 1915, Italy broke free from the Triple Alliance that it formed with Germany and Austro-Hungary by signing the Treaty of London. This meant that the two entities bordered by the Stelvio Pass were at war with each other. Mount Scorluzzo, which separated them, had a lot of advantages in the conflict.