The First Balkan War, which lasts from October 1912 to May 1913, pitts the Balkan League (Serbia, Montenegro, Greece, and Bulgaria) against the Ottoman Empire.

The combined armies of the Balkan states overcome the numerically inferior and strategically disadvantaged Ottoman armies, and achieve rapid success.

As a result of the war, almost all remaining European territories of the Ottoman Empire are captured and partitioned among the allies, and an independent Albanian state set up.

Despite their success, the Balkan states are unsatisfied with the peace settlement, and the tensions among them, with the unifying Ottoman threat gone, will soon result in the Second Balkan War.