After the removal, in 1877, of Ismail, who had appointed him to the post, Gordon resigned as governor general of Sudan in 1880. His successors lacked direction from Cairo and feared the political turmoil that had engulfed Egypt. As a result, they failed to continue the policies Gordon had put in place. The illegal slave trade revived, although not enough to satisfy the merchants whom Gordon had put out of business. The Sudanese army suffered from a lack of resources, and unemployed soldiers from disbanded units troubled garrison towns. Tax collectors arbitrarily increased taxation. 

In this troubled atmosphere, Muhammad Ahmad ibn as Sayyid Abd Allah, a faqir or holy man who combined personal magnetism with religious zealotry, emerged, determined to expel the Turks and restore Islam to its primitive purity. The son of a Dunqulah boatbuilder, Muhammad Ahmad had become the disciple of Muhammad ash Sharif, the head of the Sammaniyah order. Later, as a shaykh of the order, Muhammad Ahmad spent several years in seclusion and gained a reputation as a mystic and teacher. In 1880 he became a Sammaniyah leader. 

Muhammad Ahmad's sermons attracted an increasing number of followers. Among those who joined him was Abdallahi ibn Muhammad, a Baqqara from southern Darfur. His planning capabilities proved invaluable to Muhammad Ahmad, who revealed himself as Al Mahdi al Muntazar ("the awaited guide in the right path," usually seen as the Mahdi), sent from God to redeem the faithful and prepare the way for the second coming of the Prophet Isa (Jesus). The Mahdist movement demanded a return to the simplicity of early Islam, abstention from alcohol and tobacco, and the strict seclusion of women. 

Even after the Mahdi proclaimed a jihad, or holy war, against the Turkiyah, Khartoum dismissed him as a religious fanatic. The government paid more attention when his religious zeal turned to denunciation 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 Baqqara. From a refuge in the area, he wrote appeals to the shaykhs 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 Hadendowa Beja, who were rallied to the Mahdi by an Ansar captain, Usman Digna. 

Early in 1882, the Ansar, armed with spears and swords, overwhelmed a 7,000-man Egyptian force not far from Al Ubayyid and seized their rifles 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. Next the Mahdi captured Darfur and imprisoned Rudolf Slatin, an Austrian in the khedive's service, who later became the first Egyptianappointed governor of Darfur Province. 

The advance of the Ansar and the Beja rising in the east imperiled communications with Egypt and threatened to cut off garrisons at Khartoum, Kassala, Sannar, and Sawakin 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. 

After reaching Khartoum in February 1884, Gordon 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 was essential to Egypt's security and that to allow the Ansar a victory there would invite the movement to spread elsewhere. 

Increasing British popular support for Gordon eventually forced Prime Minister William Gladstone to mobilize a relief force under the command of Lord Garnet Joseph Wolseley. A "flying column" sent overland from Wadi Halfa across the Bayyudah Desert bogged down at Abu Tulayh (commonly called Abu Klea), where the Hadendowa Beja--the so-called Fuzzy Wuzzies--broke the British line. An advance unit that had gone ahead by river when the column reached Al Matammah arrived at Khartoum on January 28, 1885, to find the town had fallen two days earlier. The Ansar had waited for the Nile flood to recede before attacking the poorly defended river approach to Khartoum in boats, slaughtering the garrison, killing Gordon, and delivering his head to the Mahdi's tent. Kassala and Sannar fell soon after, and by the end of 1885 the Ansar had begun to move into the southern region. In all Sudan, only Sawakin, reinforced by Indian army troops, and Wadi Halfa on the northern frontier remained in Anglo-Egyptian hands . 

The Mahdiyah (Mahdist regime) imposed traditional Islamic laws. Sudan's new ruler also authorized the burning of lists of pedigrees and books of law and theology because of their association with the old order and because he believed that the former accentuated tribalism at the expense of religious unity. 

The Mahdiyah has become known as the first genuine Sudanese nationalist government. The Mahdi maintained that his movement was not a religious order that could be accepted or rejected at will, but that it was a universal regime, which challenged man to join or to be destroyed. The Mahdi modified Islam's five pillars to support the dogma that loyalty to him was essential to true belief. The Mahdi also added the declaration "and Muhammad Ahmad is the Mahdi of God and the representative of His Prophet" to the recitation of the creed, the shahada. Moreover, service in the jihad replaced the hajj, or pilgrimage to Mecca, as a duty incumbent on the faithful. Zakat (almsgiving) became the tax paid to the state. The Mahdi justified these and other innovations and reforms as responses to instructions conveyed to him by God in visions. 

The Khalifa

Six months after the capture of Khartoum, the Mahdi died of typhus. The task of establishing and maintaining a government fell to his deputies--three caliphs chosen by the Mahdi in emulation of the Prophet Muhammad. Rivalry among the three, each supported by people of his native region, continued until 1891, when Abdallahi ibn Muhammad, with the help primarily of the Baqqara Arabs, overcame the opposition of the others and emerged as unchallenged leader of the Mahdiyah. Abdallahi--called the Khalifa (successor)--purged the Mahdiyah of members of the Mahdi's family and many of his early religious disciples. 

Originally the Mahdiyah was a jihad state, run like a military camp. sharia courts enforced Islamic law and the Mahdi's precepts, which had the force of law. After consolidating his power, the Khalifa instituted an administration and appointed Ansar (who were usually Baqqara) as amirs over each of the several provinces. The Khalifa also ruled over rich Al Jazirah. Although he failed to restore this region's commercial wellbeing , the Khalifa organized workshops to manufacture ammunition and to maintain river steamboats

Regional relations remained tense throughout much of the Mahdiyah period, largely because of the Khalifa's commitment to using the jihad to extend his version of Islam throughout the world. For example, the Khalifa rejected an offer of an alliance against the Europeans by Ethiopia's negus (king), Yohannes IV. In 1887 a 60,000-man Ansar army invaded Ethiopia, penetrated as far as Gonder, and captured prisoners and booty. The Khalifa then refused to conclude peace with Ethiopia. In March 1889, an Ethiopian force, commanded by the king, marched on Qallabat; however, after Yohannes IV fell in battle, the Ethiopians withdrew. Abd ar Rahman an Nujumi, the Khalifa's best general, invaded Egypt in 1889, but British-led Egyptian troops defeated the Ansar at Tushkah. The failure of the Egyptian invasion ended the Ansar' invincibility. The Belgians prevented the Mahdi's men from conquering Equatoria, and in 1893 the Italians repulsed an Ansar attack at Akordat (in Eritrea) and forced the Ansar to withdraw from Ethiopia. 

Reconquest of Sudan

In 1892 Herbert Kitchener (later Lord Kitchener) became sirdar, or commander, of the Egyptian army and started preparations for the reconquest of Sudan. The British decision to occupy Sudan resulted in part from international developments that required the country be brought under British supervision. By the early 1890s, British, French, and Belgian claims had converged at the Nile headwaters. Britain feared that the other colonial powers would take advantage of Sudan's instability to acquire territory previously annexed to Egypt. Apart from these political considerations, Britain wanted to establish control over the Nile to safeguard a planned irrigation dam at Aswan. 

In 1895 the British government authorized Kitchener to launch a campaign to reconquer Sudan. Britain provided men and matériel while Egypt financed the expedition. The Anglo-Egyptian Nile Expeditionary Force included 25,800 men, 8,600 of whom were British. The remainder were troops belonging to Egyptian units that included six battalions recruited in southern Sudan. An armed river flotilla escorted the force, which also had artillery support. In preparation for the attack, the British established army headquarters at Wadi Halfa and extended and reinforced the perimeter defenses around Sawakin. In March 1896, the campaign started; in September, Kitchener captured Dunqulah. The British then constructed a rail line from Wadi Halfa to Abu Hamad and an extension parallel to the Nile to transport troops and supplies to Barbar. Anglo-Egyptian units fought a sharp action at Abu Hamad, but there was little other significant resistance until Kitchener reached Atbarah and defeated the Ansar. After this engagement, Kitchener's soldiers marched and sailed toward Omdurman, where the Khalifa made his last stand. 

On September 2, 1898, the Khalifa committed his 52,000-man army to a frontal assault against the Anglo-Egyptian force, which was massed on the plain outside Omdurman. The outcome never was in doubt, largely because of superior British firepower. During the five-hour battle, about 11,000 Mahdists died whereas AngloEgyptian losses amounted to 48 dead and fewer than 400 wounded.