The Balkan Wars were a series of two conflicts that took place in the Balkan states in 1912 and 1913. In the First Balkan War, the four Balkan states of Greece, Serbia, Montenegro and Bulgaria declared war upon the Ottoman Empire and defeated it, in the process stripping the Ottomans of their European provinces, leaving only Eastern Thrace under Ottoman control. In the Second Balkan War, Bulgaria fought against the other four original combatants of the first war. It also faced an attack from Romania from the north. The Ottoman Empire lost the bulk of its territory in Europe. Although not involved as a combatant, Austria-Hungary became relatively weaker as a much enlarged Serbia pushed for union of the South Slavic peoples. The war set the stage for the July crisis of 1914 and thus served as a prelude to the First World War.
The First Balkan War lasted from October 1912 to May 1913 and involved actions of the Balkan League against the Ottoman Empire. The Balkan states' combined armies overcame the initially numerically inferior and strategically disadvantaged Ottoman armies, achieving rapid success.
The Second Balkan War was a conflict that broke out when Bulgaria, dissatisfied with its share of the spoils of the First Balkan War, attacked its former allies, Serbia and Greece, on 16 (O.S.) / 29 (N.S.) June 1913. Serbian and Greek armies repulsed the Bulgarian offensive and counterattacked, entering Bulgaria. With Bulgaria also having previously engaged in territorial disputes with Romania and the bulk of Bulgarian forces engaged in the south, the prospect of an easy victory incited Romanian intervention against Bulgaria. The Ottoman Empire also took advantage of the situation to regain some lost territories from the previous war. When Romanian troops approached the capital Sofia, Bulgaria asked for an armistice, resulting in the Treaty of Bucharest, in which Bulgaria had to cede portions of its First Balkan War gains to Serbia, Greece and Romania. In the Treaty of Constantinople, it lost Adrianople to the Ottomans.
The Siege of Adrianople, was fought during the First Balkan War. The siege began on 3 November 1912 and ended on 26 March 1913 with the capture of Edirne (Adrianople) by the Bulgarian 2nd Army and the Serbian 2nd Army.
The Battle of Lule Burgas or Battle of Luleburgas – Bunarhisar took place between the Kingdom of Bulgaria and the Ottoman Empire and was the bloodiest battle of the First Balkan War. The battle took place from 28 October to 2 November 1912. The outnumbered Bulgarian forces made the Ottomans retreat to Çatalca line, 30 km from the Ottoman capital Constantinople. In terms of forces engaged it was the largest battle fought in Europe between the end of the Franco-Prussian War and the beginning of the First World War.
The Battle of Monastir took place near the town of Bitola, Macedonia during the First Balkan War, between Serbian and Ottoman forces from 16 to 19 November 1912. It resulted in a Serbian victory after heavy fighting north of the city, the routed Turks fled abandoning their guns.
The Battle of Kalimanci was fought between the Kingdom of Serbia and the Kingdom of Bulgaria during the Second Balkan War. The battle started on the 18th and ended on the 19th of July 1913. The Bulgarian Army stopped the Serbian Army from pushing them out of Macedonia and joining up with the Greek Army downstream of the river Struma. The battle ended in an important Bulgarian defensive victory.
Çatalca is a municipality and district of Istanbul Province, Turkey. Its area is 1142 km2, making it the largest district in Istanbul Province by area. Its population is 77,468 (2022). It is in East Thrace, on the ridge between the Marmara and the Black Sea. Most people living in Çatalca are either farmers or those visiting vacation homes. Many families from Istanbul come to Çatalca during weekends to hike in the forests or have picnics.
Racho Petrov Stoyanov was a leading Bulgarian general and politician.
The participation of Greece in the Balkan Wars of 1912–1913 is one of the most important episodes in modern Greek history, as it allowed the Greek state to almost double its size and achieve most of its present territorial size. It also served as a catalyst of political developments, as it brought to prominence two personalities, whose relationship would dominate the next decade and have long-lasting repercussions for Greece: the Prime Minister Eleftherios Venizelos, and the Army's commander-in-chief, the Crown Prince and later King, Constantine I.
Independent Albania was proclaimed on 28 November 1912. This chapter of Albanian history was shrouded in controversy and conflict as the larger part of the self-proclaimed region had found itself controlled by the Balkan League states: Serbia, Montenegro and Greece from the time of the declaration until the period of recognition when Albania relinquished many of the lands originally included in the declared state. Since the proclamation of the state in November 1912, the Provisional Government of Albania asserted its control over a small part of central Albania including the important cities of Vlorë and Berat.
The siege of Vidin was an attempt by the Serbian Army to seize the Bulgarian city of Vidin during the Second Balkan War. The siege took place between 12 and 18 July 1913.
The First Battle of Çatalca was one of the heaviest battles of the First Balkan War fought between 17 and 18 November [O.S. 4–5 November] 1912. It was initiated as an attempt of the combined Bulgarian First and Third armies, under the overall command of lieutenant general Radko Dimitriev, to defeat the Ottoman Army stationed in Çatalca and break through the last Turkish defensive line before the capital Constantinople. The high casualties however forced the Bulgarians to call off the attack.
The following is the Bulgarian order of battle at the beginning of the First Balkan War as of October 8, 1912. After its mobilization the field army counted for 366,209 men and represented half the field forces of the Balkan League. Its greater part was deployed in the main theater of the war in Thrace but the army also contributed to the allied war effort in Macedonia. This order of battle includes all combat units, including engineer and artillery units, but not medical, supply, signal and border guard units.
The Greek–Serbian Alliance of 1913 was signed at Thessaloniki on 1 June 1913, in the aftermath of the First Balkan War, when both countries wanted to preserve their gains in Macedonia from Bulgarian expansionism. The treaty formed the cornerstone of Greek–Serbian relations for a decade, remaining in force through World War I until 1924.
The Battle of Knjaževac took place during the Second Balkan War, fought between the Bulgarian and the Serbian army in July 1913. It ended with the capture of the Serbian city by the Bulgarian 1st Army.
The Battle of Pirot were engagements between the Bulgarian and Serbian armies in the surroundings of Pirot near the Serbian–Bulgarian border between 6 and 8 July 1913.
Events from the year 1913 in Italy.
The Bulgarian Front of First Balkan War was one of the heaviest fronts of the First Balkan War fought between 21 October 1912 and 3 April 1913
The following is a tabulation of Ottoman Empire casualties of war.
Serbia 
Montenegro 
Bulgaria 
