After suppressing Cüneyt Bey's revolt, Mehmed Çelebi gathered his troops at Ankara.

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

[3] Both armies met at Çamurlu, near modern-day Samokov, south east of Sofia, Bulgaria.

Initially, Musa appeared to be winning the battle despite the defection of Pasha Yigit and Sinan Bey of Trikkala.

[3] However, the tide of the battle turned in favor of Mehmed, with the help of Serb and Byzantine troops, and Musa Çelebi fled.