Second Balkan War

Second Balkan War
Part of the Balkan Wars

Map of the mainland operations of the Allied belligerents
(amphibious actions not shown)
Date
  • 29 June – 10 August 1913
  • (1 month, 1 week and 5 days)
Location
Result Bulgarian defeat
Territorial
changes
Belligerents
 Bulgaria
Commanders and leaders
Strength
600,000+
  • 348,000
  • 330,000
  • 148,000
  • 12,800
  • 255,000
  • Total: 1,093,802
Casualties and losses
 Kingdom of Bulgaria:
  • 7,583 killed
  • 9,694 missing
  • 42,911 wounded
  • 3,049 deceased
  • 140 artillery pieces captured or destroyed
  • Total: 65,927 killed or wounded
 Serbia: 50,000
  • 9,000 killed
  • 36,000 wounded
  • 5,000 dead of disease
  •  Romania: 1,600
  • negligible combat casualties
  • 1,600 dead of a cholera outbreak
  •  Greece: 29,886
  • 5,851 killed in action
  • 23,847 wounded in action
  • 188 missing in action
  •  Montenegro: 1,201
  • 240 killed
  • 961 wounded
  •  Ottoman Empire: 4,000+
  • negligible combat casualties
  • 4,000 dead of disease
  • Total:
  • c. 76,000 combat casualties
  • c. 91,000 total losses

The Second Balkan War (29 June – 10 August 1913) was a conflict fought between the Kingdom of Bulgaria and its former Balkan League allies, Serbia and Greece, who were later joined by Romania and the Ottoman Empire. The war began when Bulgaria, unhappy with the division of territory after the First Balkan War, launched attacks on Serbian and Greek forces, who repelled the offensive and pushed into Bulgarian territory. With most of Bulgaria’s army committed in the south, Romania intervened from the north. The Ottoman Empire also took advantage of the situation to recover territories lost the previous year.

As Bulgaria suffered military setbacks on multiple fronts and Romanian forces advanced towards its capital, Sofia, it requested an armistice. The war ended with the Treaty of Bucharest, which compelled Bulgaria to cede significant territory: Southern Dobruja to Romania, parts of Macedonia to Serbia and Greece, and Adrianople (Edirne) to the Ottoman Empire under the separate Treaty of Constantinople.

The war altered the political balance in the Balkans and intensified regional tensions. Serbia expanded its territory and influence, heightening its rivalry with Austria-Hungary. Bulgaria, weakened by defeat and territorial losses, would later align with the Central Powers in the First World War.