 After Muhammad expelled them from Medina in 625, their leaders moved to their estates in Khaybar in order to prepare for war against Muhammad and to recruit the aid of Arab tribes.Muhammad first sent disguised guests to the homes of the leaders of Banū Naḍīr who then killed their hosts.Muhammad's victory over the Jews of Khaybar in the subsequent battle was also aided by the distance of the settlements and their castles from one another, the absence of coordination between the fighting forces, the death of the leader Sallām ibn Mishkam, and a Jew who showed the Muslims the secret entrances to one of the fortresses.