On the 9th of October 1912 the Balkan League including Bulgaria, Greece, Serbia and Montenegro declared war on the Ottoman Empire.
The aim of the Balkan League was to liberate their brothers under Turkish rule.
The whole world was astonished by the victories of the Bulgarian Army which liberated the City-Fortress of Odrin. The walls of Odrin were constructed by German engineers and the city was considered to be one of the most well-protected cities in the world.
However the Bulgarians liberated it in less than a week. The Ottoman Empire suffered great losses and drew back its forces behind the line of Midia-Enos.