Question: Who were the allies Bulgaria and Montenegro during the First Balkan War?
About the article "Balkan Wars", section "First Balkan War".

Candidate passages:
The First Balkan War (, , , ), which lasted from October 1912 to May 1913, pitted the Balkan League (Serbia, Greece, Montenegro and Bulgaria) against the Ottoman Empire.
The combined armies of the Balkan states overcame the numerically inferior and strategically disadvantaged Ottoman armies and achieved rapid success.
As a result of the war, almost all remaining European territories of the Ottoman Empire were captured and partitioned among the allies.
Ensuing events also led to the creation of an independent Albanian state.
Despite its success, Bulgaria was dissatisfied over the division of the spoils in Macedonia, which provoked the start of the Second Balkan War. 
The antagonisms between the Christian states (Serbia, Montenegro, Greece and Bulgaria) still persisted, and after the successful conclusion of the First Balkan War, they resurfaced, especially over the partition of Macedonia.
In Treaty of London, 1913 the allies (see:Balkan League) disagree about the division of Macedonia. 
The three new Balkan states formed at the end of the 19th century and Montenegro, sought additional territories from the Albania, Macedonia, and Thrace regions, behind their nationalistic arguments.
The incomplete emergence of these nation-states on the fringes of the Ottoman Empire during the nineteenth century set the stage for the Balkan Wars.
On 10 October 1912 the collective note of the powers was handed in at Constantinople.
CUP responded to demands of European powers on reforms in Macedonia on 14 October.
But before further action could be taken war broke out.
While Powers were asking Empire to reform Macedonia, under the encouragement of Russia, a series of agreements were concluded: between Serbia and Bulgaria in March 1912, between Greece and Bulgaria in May 1912, and Montenegro subsequently concluded agreements between Serbia and Bulgaria respectively in October 1912.
The Serbian-Bulgarian agreement specifically called for the partition of Macedonia which resulted in the First Balkan War.
In 1913 a nationalist uprising broke out in Albania, and on 8 October, the Balkan League, consisting of Serbia, Montenegro, Greece and Bulgaria, mounted a joint attack on the Ottoman Empire, starting the First Balkan War.
The strong march of the Bulgarian forces in Thrace pushed the Ottoman armies to the gates of Istanbul.
The Second Balkan War soon followed.
Albania declared independence on 28 November, Empire agreed to a ceasefire on 2 December, and its territory losses were finalized in 1913 in the treaties of London and Bucharest.
Albania became independent, and the Empire lost almost all of its European territory (Kosovo, Sanjak of Novi Pazar, Macedonia and western Thrace) to the four allies. 
In the First Balkan War, the coalition of Bulgaria, Serbia, Greece and Montenegro defeated the Ottoman Empire.
The Ottomans lost nearly all their European possessions, which were reduced to a small amount of territory around the Sea of Marmara by the Treaty of London.
The Ottomans however were able to recover Eastern Thrace, during the Second Balkan War, when Bulgaria attacked her former allies and was defeated by the combined forces of all her neighbours.
During the First Balkan War, fighting against the Ottomans, Greece had occupied most of Epirus, southern Macedonia with the great port city of Thessaloniki and most of the islands of the Aegean Sea (except the Italian-occupied Dodecanese).
In the second war, it expanded its territory in Macedonia further at the expense of Bulgaria.
Since Western Thrace remained under Bulgarian control (it would be ceded to Greece in the 1919 Treaty of Neuilly), Greece shared no land border with Ottoman Empire.
Greco-Turkish tensions however remained high, since the Ottoman government refused to accept Greek control over the islands of the northeastern Aegean. 
The Balkan League (, "Balkanski sŭyuz", "Balkaniki Symmachia", "Balkanski savez") was an alliance formed by a series of bilateral treaties concluded in 1912 between the Balkan states of Greece, Bulgaria, Serbia and Montenegro, and directed against the Ottoman Empire, which at the time still controlled much of the Balkan peninsula.
The Balkans had been in a state of turmoil since the early 1900s, with years of guerrilla warfare in Macedonia followed by the Young Turk Revolution and the protracted Bosnian Crisis.
The outbreak of the Italo-Turkish War in 1911 had further weakened the Ottomans and emboldened the Balkan states.
Under Russian influence, Serbia and Bulgaria settled their differences and signed an alliance, originally directed against Austria-Hungary on 13 March 1912, but by adding a secret chapter to it essentially redirected the alliance against the Ottoman Empire.
Serbia then signed a mutual alliance with Montenegro, while Bulgaria did the same with Greece.
The League was victorious in the First Balkan War which broke out in October 1912, where it successfully wrestled control of almost all European Ottoman territories.
Following this victory however, the old differences between the allies re-emerged over the division of the spoils, particularly Macedonia, leading to the effective break-up of the League, and soon after, on 16 June 1913, Bulgaria attacked her erstwhile allies, beginning the Second Balkan War.