Bulgaria during World War I
The Kingdom of Bulgaria participated in World War I on the side of the Central Powers from 14 October 1915, when the country declared war on Serbia, until 30 September 1918, when the Armistice of Salonica came into effect.
A German postcard commemorating the entry of Bulgaria into the war.
Territorial changes following the two Balkan Wars.
A Punch cartoon of the Second Balkan War.
Vasil Radoslavov (c.1915). Prime minister from 1913 to 1918.
The Tsardom of Bulgaria, also referred to as the Third Bulgarian Tsardom, sometimes translated in English as the "Kingdom of Bulgaria", or simply Bulgaria, was a constitutional monarchy in Southeastern Europe, which was established on 5 October 1908, when the Bulgarian state was raised from a principality to a tsardom.
Ferdinand I of Bulgaria at the proclamation of Bulgarian independence, 1908
Boundaries on the Balkans after the First and the Second Balkan War (1912–1913)
Areas where Bulgarians were the majority of the population (in light green) according to Anastas Ishirkov (1912).
Bulgarian officers on the Macedonian front