The Prophet's Last Days

During the Prophet's last days, when it became evident that he was sick and he wasn't going to be getting better any time soon, different parts of the Muslim community began to rebel or break off. People who had at one time claimed to have allegiance to the Prophet Muhammad, Salallahu Alayhi Wasallam, decided to call themselves prophets. However, despite the problems that were coming up with these false prophets, Prophet Muhammad sent Usama ibn Zayed with an army to take care of and intimidate the Byzantine Allied Arab tribes in northern Arabia. When Abu Bakr is named the caliph, most of Arabia cancels their alliance with Medina and Abu Bakr.