Sheikh Mubarak and Abdul Rahman mounted an expedition against the Al Rashid (who were led by Abdul Aziz bin Mutaib Al Rashid, known as Ibn Rashid). The expedition comprised a powerful military force supported by a number of important bedouin leaders but, when some of the bedouin participants defected to the Al Rashid, Abdul Rahman and Sheikh Mubarak were defeated at the battle of Sarif, near Unaizah.