Conquest of al-Hasa
The Conquest of al-Hasa was achieved by the Saudi forces of ibn Saud with support from the Ikhwan in April 1913. The Oasis of al-Hasa was conquered from an Ottoman garrison, who had controlled the area since 1871.
Although Saudi Shia religious community leaders negotiated a surrender and recognition of the Wahhabi political authority in exchange for leniency, the Shia communities in al-Hasa and Qatif were subjected to harsh oversight and cruelty.
The Ottomans swiftly acknowledged the loss of al-Hasa, and recognized al-Hasa and Nejd as being under the rule of Ibn Saud.
