The Mahdist War, 1881 – 1899, was a major uprising in Turko-Egyptian Sudan. Egypt was at the time an autonomous state paying tribute to the Ottoman Empire, though owning large shares in the Suez Canal meant Britain had much influence and interest in the region. The causes of the war were numerous: anger at foreign subjugation, religious fundamentalism, and the abolition of the slave trade on which the Sudanese economy thrived. Sudanese cleric Muhammad Ahmad took advantage of these tensions and, in June 1881, declared himself the Islamic Mahdi, "The Guided One." With this proclamation, he promised to rid the world of evil and establish a worldwide Islamic Caliphate, which would allow for the return of the Messiah and the culmination of the End Times. From 1870 he gathered followers, by 1881 the uprising had begun, and by 1883 the Mahdist army was a serious fighting force, experienced and well-armed.