of tax collectors. To avoid arrest, the Mahdi and a party of his followers, the Ansar, made a long march to Kurdufan, where he gained a large number of recruits, especially from the Baggara. From a refuge in the area, he wrote appeals to the sheikhs of the religious orders and won active support or assurances of neutrality from all except the pro-Egyptian Khatmiyyah. Merchants and Arab tribes that had depended on the slave trade responded as well, along with the Hadendoa Beja, who were rallied to the Mahdi by an Ansar captain, Osman Digna. Advancing attacks Early in 1882, the Ansar, armed with spears and swords, overwhelmed a British-led 7,000-man Egyptian force not far from Al Ubayyid and seized their rifles, field guns and ammunition. The Mahdi followed up this victory by laying siege to Al Ubayyid and starving it into submission after four months. The Ansar, 30,000 men strong, then defeated an 8,000-man Egyptian relief force at Sheikan. To the west, the Mahdist uprising was able to count on existing resistance movements. The Turkish rule of Darfur had been resented by locals, and several rebels had already begun revolts. Baggara rebels under Rizeigat chief Madibo pledged themselves to the Mahdi and besieged Darfur's Governor-General Rudolf Carl von Slatin, an Austrian in the khedive's service, at Dara. Slatin was captured in 1883, and more Darfuri tribes consequently joined the revolutionaries. Mahdist forces soon took control of most of Darfur. At first, the regime change was very popular in Darfur. The advance of the Ansar and the Hadendowa rising in the east imperiled communications with Egypt and threatened to cut off garrisons at Khartoum, Kassala, Sennar, and Suakin and in the south. To avoid being drawn into a costly military intervention, the British government ordered an Egyptian withdrawal from Sudan. Gordon, who had received a reappointment as governor general, arranged to supervise the evacuation of Egyptian troops and officials and all foreigners from Sudan. British response After reaching Khartoum in February 1884, Gordon soon realized that he could not extricate the garrisons. As a result, he called for reinforcements from Egypt to relieve Khartoum. Gordon also recommended that Zubayr, an old enemy whom he recognized as an excellent military commander, be named to succeed him to give disaffected Sudanese a leader other than the Mahdi to rally behind. London rejected this plan. As the situation deteriorated, Gordon argued that Sudan