In 2004, Nicoll published a biography of the Mahdi of Sudan, The Sword of the Prophet:The Mahdi of Sudan and the Death of General Gordon.
Ali's reign in Sudan, and that of his immediate successors, is remembered in Sudan as brutal and heavy-handed, contributing to the popular independence struggle of the self-proclaimed Mahdi, Muhammad Ahmad, in 1881.
Examples include Abd al-Qadir in Algeria, the Mahdi in Sudan, Shamil in the Caucasus, the Senussi in Libya and in Chad, Mullah-i Lang in Afghanistan, the Akhund of Swat in India, and later, Abd al-Karim in Morocco.
When Muhammad Ahmad proclaimed himself the Mahdi, and incited Sudan into a long and violent revolt, his followers successfully either drove the Egyptian garrisons out of Sudan, or isolated them at Suakin and at various posts in the south.
Muhammad | Muhammad Ali | Muhammad Yunus | Muhammad Ali Jinnah | Muhammad Iqbal | Muhammad Ali of Egypt | Abdullah Ahmad Badawi | Hussain Muhammad Ershad | Muhammad Shah | Ahmad Shah Durrani | Ahmad Shah Massoud | Ahmad | Raja Muhammad Fayyaz Ahmad | Muhammad al-Mahdi | Fandi Ahmad | Muhammad Ahmad | Muhammad Abdul Qadeer Siddiqi Qadri | Salman Ahmad | Nur Muhammad Taraki | Muhammad Saleh Kamboh | Muhammad al-Baqir | Mirza Tahir Ahmad | Mirza Ghulam Ahmad | Khwaja Ahmad Abbas | Idris Muhammad | Atta Muhammad Nur | Shafi Muhammad Burfat | Raffi Ahmad | Omar Ahmad Omar al-Hubishi | Muhammad Siddique Dar |
After the failure of that movement at the Battle of Tel al-Kebir (September 13, 1882), he attached himself to the cause of the Mahdi.