The Saudi conquest of Hail, also known as the Third Saudi–Rashidi War or the Fall of Hail, was a conflict between the Third Saudi State and the Emirate of Jabal Shammar, led by its final Rashidi ruler, Muhammad bin Talal. The Saudi forces were led by Ibn Saud. On 2 November 1921, Rashidi resistance collapsed, and the ruler of Jabal Shammar surrendered to Saudi forces, marking the end of the last Ottoman ally in the Arabian Peninsula.
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Text from the Wikipedia article “Conquest of Ha'il”, available under CC BY-SA 4.0.