Mehmed and Musa
Manuel II Palaiologos, the Byzantine emperor, had been the ally of Suleyman; Mûsa therefore besieged Constantinople. Manuel called on Mehmed to protect him, and Mehmed's Ottomans now garrisoned Constantinople against Musa's Ottomans of Thrace. Mehmed made several unsuccessful sallies against his brother's troops, and was obliged to re-cross the Bosporus to quell a revolt that had broken out in his own territories. Mûsa now pressed the siege of Constantinople. Mehmed returned to Thrace, and obtained the assistance of Stefan Lazarevic, the Serbian King.
The armies of the rival Ottoman brothers met on the plain of Chamurli (today Samokov, Bulgaria). Hassan, the Aga of the Janissaries of Mehmed, stepped out before the ranks and tried to get the troops to change sides. Mûsa rushed towards Hassan and killed him, but was himself wounded by an officer who had accompanied Hassan. Mûsa's Ottomans fought well, but the battle was won by Mehmed and his allies. Mûsa and his army fled, until he was shot from his horse and then killed by one of Mehmed's commanders. With Mûsa dead, Mehmed was the sole surviving son of the late Sultan Bayezid I and became Sultan Mehmed I. The Interregnum was a striking example of the fratricide that would become common in Ottoman successions.
Read more about this topic: Ottoman Interregnum