The Second Balkan War took place from June to August 1913, following the First Balkan War. It involved the Balkan League members—Serbia, Greece, and Montenegro—against Bulgaria. The conflict arose over territorial disputes after the defeat of the Ottoman Empire, particularly regarding the division of land in Macedonia. The war ended with the signing of the Treaty of Bucharest in August 1913, which significantly reduced Bulgaria's territorial gains. Serbia and Greece expanded their territories, while Romania also gained land. The war heightened tensions in the region, setting the stage for future conflicts leading to World War I.