With Timur's departure, even Bayezid's sons are able to assume control over the family's former possessions in western Anatolia.

The descendants of the Turkmen notables who had assisted the early Ottoman conquests in Europe support the claims of Mehmed, who rules in Amasya.

With the additional support of the Anatolian Muslim religious orders and artisan guilds…

…Mehmed is able to defeat and strangle his brother Isa Bey of Balikesir in southwestern Anatolia, and seize Bursa.

He now sends another brother, Mûsa Bey, against Süleyman.