Albanian–Yugoslav border war (1921)

The Albanian–Yugoslav border war of 1921 arose from disputes over the borders of the newly established Principality of Albania after the First Balkan War. Although the 1913 Treaty of London outlined general territorial terms for Albania, precise borders remained unresolved amid the chaos of World War I, the Paris Peace Conference, and the League of Nations' formation.

Source: Wikipedia — Albanian–Yugoslav border war (1921) (CC BY-SA 4.0)