Ahmed Izzet Pasha
The tribal chiefs were difficult to appease and an endless cycle of violence curbed the Ottoman efforts to pacify the land. Ahmed Izzet Pasha proposed that the Ottoman army should evacuate the highlands and confined itself to Tihama and not to be unnecessarily burdened with continuing military operation against the Zaydi tribes. The hit-and-run tactics of the northern highlands tribesmen wore out the Ottoman military. They resented the Turkish Tanzimat and defied all attempts to impose a central government upon them. The northern tribes united under the leadership of the House of Hamidaddin in 1890. Imam Yahya Hamidaddin led a rebellion against the Turks in 1904, the rebels disrupted the Ottoman ability to govern. The revolts between 1904 and 1911 were especially damaging to the Ottomans, costing them as much as 10,000 soldier and 500,000 pound per year. The Ottomans signed a treaty with imam Yahya Hamidaddin in 1911. Under the treaty, imam Yahya was recognized as an autonomous leader of the Zaydi northern highlands. The Ottomans continued to rule Shafi'i areas in the mid-south until their departure in 1918.