Battle of Çamurlu

The Battle of Çamurlu was fought on July 5, 1413, between brothers and princes Musa Çelebi and Mehmet I, then known as Mehmet Çelebi, as the last conflict of the Ottoman civil war known as the Ottoman Interregnum. This battle decided which son of Bayezid I would finally reunite the Ottoman Empire.

Mehmet's invasion and final battle
After suppressing Cüneyt Bey's revolt, Mehmet Çelebi gathered his troops at Ankara. With his Dulkadirid father-in-law, he began planning an invasion of Rumelia (the European part of the empire and Musa's stronghold) to defeat his brother, Musa. On his march to Bursa, Mehmet gained contingents of troops from western Anatolia. Upon reaching the straits, Mehmet's army was given passage by ships loaned from Manuel II Palaiologos, who also supplied Mehmet with some troops.

Mehmet marched his army from Constantinople to Edirne. He then marched onto Kosovo to join forces with his ally (and also half-uncle) Serbian king Stefan Lazarević, along with receiving information from Ewrenos concerning possible defections during the battle.

Both armies met at Çamurlu, near modern day Sofia, Bulgaria. Initially, Musa appeared to be winning the battle despite the defection of Pasha Yigit and Sinan Bey of Trikkala. However, the tide of the battle turned in favor of Mehmet, with the help of Serb and Byzantine troops, and Musa Çelebi fled.

Afterwards
Following the battle, Musa Çelebi was captured and strangled. This battle re-established the unity of the Ottoman state, under the control of Mehmet I.