Question: Who helped the Bulgarian forces to conquer Adrianople?
About the article "Balkan Wars", section "First Balkan War".

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Battle of Adrianople (378) was the main battle of the Gothic War (376-382).
Battle of Adrianople may also refer to: Battle of Adrianople (313), also known as Battle of Tzirallum, Licinius defeats Maximinus Daia Battle of Adrianople (324), Constantine the Great defeats Licinius in a Roman civil war Siege of Adrianople (378), siege by the Goths following the Battle of Adrianople (378) Battle of Adrianople (718), part of the Byzantine–Bulgarian wars Siege of Adrianople (813), part of the Byzantine–Bulgarian wars Battle of Adrianople (914), part of the Byzantine–Bulgarian wars Sack of Adrianople (1003), part of the Byzantine–Bulgarian wars Battle of Adrianople (1094), between the Byzantine throne and a usurper Battle of Adrianople (1205), part of the Fourth Crusade, the Bulgarians defeat the Crusaders Battle of Adrianople (1254), part of the Byzantine–Bulgarian wars Battle of Adrianople (1255), engagement in one of the Byzantine civil wars Battle of Adrianople (1355), Byzantine victory over the Serbs Battle of Adrianople (1829), Russians seize the city from the Ottoman Empire Siege of Adrianople (1912–13), First Balkan War battle Second Battle of Adrianople, Second Balkan War battle  
It is not possible to precisely list the units of the Roman army at Adrianople.
The only sources are Ammianus, who describes the battle but mentions few units by name, and the eastern Notitia Dignitatum, which lists Roman army units in the late 4th to early 5th century, after Theodosius.
Many units listed in the Balkans were formed after Adrianople; others were transferred from other parts of the Empire, before or after Adrianople; others are listed in two or more sectors.
Some units at Adrianople may have been merged or disbanded due to their losses.
The Roman forces consisted of heavy infantry, various archers and cavalry. 
The Strandzha Commune or Strandzha Republic was a short-lived Bulgarian political entity, proclaimed during the Preobrazhenie Uprising in 1903 by Internal Macedonian Adrianople Revolutionary Organization rebels in Strandzha.
By 1903, the anarchist Mihail Gerdzhikov became a guerrilla commander in the Internal Macedonian Adrianople Revolutionary Organisation’s armed wing in Thrace, the "Mortal Combat Body " which helped stage a revolt against the Ottomans in Edirne Vilayet.
In the Ilinden–Preobrazhenie Uprising Gerdzhikov's forces about 2,000 strong, facing a Turkish garrison of 10,000 well-armed troops, managed to establish a liberated zone in the Strandzha Mountains, centered in Vasiliko.
This successful mass insurrection supported by militia operations allowed a large part of Eastern Thrace to be taken by the rebels.
In the region the population celebrated for about three weeks.
A new communitarian system was set up and all questions were resolved in a spirit of mutual agreement between Bulgarians and Greeks receded.
The Turkish government was surprised by the uprising, taking extraordinary military measures to suppress it.
The Ottomans managed to destroy the Strandzha Republic, committing atrocities against the rebel forces and the local population.  
In the spring of 1208 Boril considered that the internal situation in Bulgaria had calmed down and turned his attention to the foreign-political affairs.
It seems that he supported the policy of his predecessor and continued the war against the Latin Empire.
The Bulgarian army invaded Thrace and defeated the Crusaders near Beroe (modern Stara Zagora).
Inspired, Boril marched southward and, on 30 June 1208, he encountered the main Latin army.
The Bulgarians outnumbered its enemies - Boril had 33,000 soldiers while Henry had 2,000 knights and several thousand soldiers - and Boril tried to apply the same tactics used by Kaloyan at Adrianople - the mounted archers harassed the Crusaders trying to stretch their line to lead them towards the main Bulgarian forces.
The knights, however, had learned the bitter lesson from Adrianople and did not repeat the same mistake.
Instead, they organized a trap and attacked the detachment which was personally commanded by the Tsar, who had only 1,600 men and could not withstand the assault.
Boril fled and the whole Bulgarian army pulled back.
The Bulgarians knew that the enemy would not chase them into the mountains so they retreated towards one of the eastern passes of the Balkan mountains, Turia.
The Crusaders who followed the Bulgarian army were attacked in a hilly country near the contemporary village of Zelenikovo by the Bulgarian rear guard and, after a bitter fight, were defeated.
However, their formation did not collapse as the main Latin forces arrived and the battle continued for a very long time until the Bulgarians retreated to the north after the bulk of their army had safely passed through the mountains.
The Crusaders then retreated to Philippopolis. 
As a result of the battle most of the population left the town.
The Turkish inhabitants of the area fled during the Bulgarian advance.
The defeated Ottomans retreated to Mestanlı (present day: Momchilgrad), while the Haskovo Detachment prepared defenses along the Arda.
Thus the flank and the rear of the Bulgarian armies advancing towards Adrianople and Constantinople were secured.
Concerned that after the fall of Kardzhali the Bulgarians would cut off the railway between Salonika and Dedeagach, the Ottoman High Command decided to distract the Bulgarians.
Its haste orders for counter-attack of the Eastern Army led to the crushing defeat of the Ottomans in the battle of Kirk Kilisse.
The Bulgarian command did not proceed with the advance after the fall of Kardzhali.
Instead of taking Gumuljina, on 23 October the main forces of the Haskovo Datachment were ordered to go east and participate in the siege of Adrianople.
Only a small squad was left in Kardzhali.