The Ottomans were expelled in an uprising in 1915, following which the city fell under the rule of the British Empire. The sheikhs of Najaf rebelled in 1918, killing the British governor of the city, that is Sayyed Mahdi Al-Awadi, and cutting off grain supplies to the Anaza, a tribe allied with the British. In retaliation the British besieged the city and cut off its water supply. The rebellion was put down and the rule of the sheikhs was forcibly ended. A great number of the Shi‘i ‘Ulema’ were expelled into Persia, where they set the foundations for the rise of the city of Qom as the center of the Shi‘ite learning and authority, in lieu of Najaf. Najaf lost its religious primacy to Qom, and was not to regain it until the 21st century, during the establishment of a Shī‘ī-majority government in Iraq after 2003.