 According to a Byzantine short chronicle compiled in , "on 10 June, Wednesday, at the fourth hour after midday, Mihaloğlu attacked Constantinople", thus beginning the siege of the city.The eyewitness John Kananos describes how the vanguard under Mihaloğlu ravaged the city's suburbs, before Murad himself arrived on 20 June with the main army and the siege engines, and the siege began in earnest.Murad was forced to lift the siege due to the rebellion of his younger brother, Küçük Mustafa, in Anatolia.