Thanks To The Treaty Of Vienna
Both sides signed the Treaty of Vienna in 1866 and lived in relative peace for a long time. They were even allies during the commencement of hostilities in July 1914. However, as the complex battle extended over the region, longstanding animosity between the two began to resurface.
After The Treaty Of London
By signing the Treaty of London in 1915, Italy broke loose from the Triple Alliance it had created with Germany and Austro-Hungary. This meant that the two entities on opposite sides of the Stelvio Pass were at odds. The fight had many advantages for Mount Scorluzzo, which separated them.