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Second Balkan War
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.
During the First Balkan War, which began in October 1912, the Balkan League (Bulgaria, Serbia, Montenegro and Greece) succeeded in driving out the Ottoman Empire from its European provinces (Albania, Macedonia, Sandžak and Thrace), leaving the Ottomans with only East Thrace. The Treaty of London, signed on 30 May 1913, which ended the war, acknowledged the Balkan states' gains west of the Enos–Midia line, drawn from Midia (Kıyıköy) on the Black Sea coast to Enos (Enez) on the Aegean Sea coast, on an uti possidetis basis, and created an independent Albania.
However, the relations between the victorious Balkan allies quickly soured over the division of the land, specifically in Macedonia. During the pre-war negotiations that resulted in the Balkan League's establishment, a secret agreement on 13 March 1912 was signed by Serbia and Bulgaria, which determined their future boundaries, effectively sharing northern Macedonia. In case of a post-war disagreement, the area to the north of the Kriva Palanka–Ohrid line (with both cities going to the Bulgarians) had been designated as a "disputed zone" under Russian arbitration, with the area to the south of this line assigned to Bulgaria. During the war, the Serbs succeeded in capturing an area far south of the agreed border, down to the Bitola–Gevgelija line (both in Serbian hands). At the same time, the Greeks advanced north, occupying Thessaloniki shortly before the Bulgarians arrived and establishing a common Greek border with Serbia.
When Bulgarian delegates in London bluntly warned the Serbs that they must not expect Bulgarian support on their Adriatic claims, the Serbs angrily replied that that was a blatant withdrawal from the prewar agreement of mutual understanding according to the Kriva Palanka-Adriatic line of expansion. The Bulgarians insisted that the Vardar Macedonian part of the agreement remained active, and the Serbs were still obliged to surrender the area as agreed. The Serbs responded by accusing the Bulgarians of maximalism, pointing out that if they lost both northern Albania and Vardar Macedonia, their participation in the common war would have been virtually for nothing.
When Bulgaria called upon Serbia to honour the pre-war agreement over northern Macedonia, the Serbs, displeased at the Great Powers' requiring them to give up their gains in north Albania, adamantly refused to evacuate any more territory. The developments ended the Serbo-Bulgarian alliance and made a future war between the two countries inevitable. Soon, minor clashes broke out along the borders of the occupation zones with the Bulgarians against the Serbs and the Greeks. Responding to the perceived Bulgarian threat, Serbia started negotiations with Greece, which also had reasons to be concerned about Bulgarian intentions.
On 19 May/1 June 1913, two days after the signing of the Treaty of London and just 28 days before the Bulgarian attack, Greece and Serbia signed a secret defensive alliance, confirming the current demarcation line between the two occupation zones as their mutual border and concluding an alliance in case of an attack from Bulgaria or from Austria-Hungary. With this agreement, Serbia succeeded in making Greece a part of its dispute over northern Macedonia, since Greece had guaranteed Serbia's current (and disputed) occupation zone in Macedonia. In an attempt to halt the Serbo-Greek rapprochement, Bulgarian Prime Minister Geshov signed a protocol with Greece on 21 May, agreeing on a permanent boundary between their respective forces, effectively accepting Greek control over southern Macedonia. However, his later dismissal ended the diplomatic targeting of Serbia.
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Second Balkan War
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.
During the First Balkan War, which began in October 1912, the Balkan League (Bulgaria, Serbia, Montenegro and Greece) succeeded in driving out the Ottoman Empire from its European provinces (Albania, Macedonia, Sandžak and Thrace), leaving the Ottomans with only East Thrace. The Treaty of London, signed on 30 May 1913, which ended the war, acknowledged the Balkan states' gains west of the Enos–Midia line, drawn from Midia (Kıyıköy) on the Black Sea coast to Enos (Enez) on the Aegean Sea coast, on an uti possidetis basis, and created an independent Albania.
However, the relations between the victorious Balkan allies quickly soured over the division of the land, specifically in Macedonia. During the pre-war negotiations that resulted in the Balkan League's establishment, a secret agreement on 13 March 1912 was signed by Serbia and Bulgaria, which determined their future boundaries, effectively sharing northern Macedonia. In case of a post-war disagreement, the area to the north of the Kriva Palanka–Ohrid line (with both cities going to the Bulgarians) had been designated as a "disputed zone" under Russian arbitration, with the area to the south of this line assigned to Bulgaria. During the war, the Serbs succeeded in capturing an area far south of the agreed border, down to the Bitola–Gevgelija line (both in Serbian hands). At the same time, the Greeks advanced north, occupying Thessaloniki shortly before the Bulgarians arrived and establishing a common Greek border with Serbia.
When Bulgarian delegates in London bluntly warned the Serbs that they must not expect Bulgarian support on their Adriatic claims, the Serbs angrily replied that that was a blatant withdrawal from the prewar agreement of mutual understanding according to the Kriva Palanka-Adriatic line of expansion. The Bulgarians insisted that the Vardar Macedonian part of the agreement remained active, and the Serbs were still obliged to surrender the area as agreed. The Serbs responded by accusing the Bulgarians of maximalism, pointing out that if they lost both northern Albania and Vardar Macedonia, their participation in the common war would have been virtually for nothing.
When Bulgaria called upon Serbia to honour the pre-war agreement over northern Macedonia, the Serbs, displeased at the Great Powers' requiring them to give up their gains in north Albania, adamantly refused to evacuate any more territory. The developments ended the Serbo-Bulgarian alliance and made a future war between the two countries inevitable. Soon, minor clashes broke out along the borders of the occupation zones with the Bulgarians against the Serbs and the Greeks. Responding to the perceived Bulgarian threat, Serbia started negotiations with Greece, which also had reasons to be concerned about Bulgarian intentions.
On 19 May/1 June 1913, two days after the signing of the Treaty of London and just 28 days before the Bulgarian attack, Greece and Serbia signed a secret defensive alliance, confirming the current demarcation line between the two occupation zones as their mutual border and concluding an alliance in case of an attack from Bulgaria or from Austria-Hungary. With this agreement, Serbia succeeded in making Greece a part of its dispute over northern Macedonia, since Greece had guaranteed Serbia's current (and disputed) occupation zone in Macedonia. In an attempt to halt the Serbo-Greek rapprochement, Bulgarian Prime Minister Geshov signed a protocol with Greece on 21 May, agreeing on a permanent boundary between their respective forces, effectively accepting Greek control over southern Macedonia. However, his later dismissal ended the diplomatic targeting of Serbia.