From his announcement of the Mahdiyya in June 1881 until the fall of Khartoum in January 1885, Muhammad Ahmad led a successful military campaign against the Turco-Egyptian government of the Sudan. The fighting ended with the death of Gordon in Khartoum. After Muhammad Ahmad's unexpected death on 22 June 1885, only six months after the conquest of Khartoum, his chief deputy took over the administration of the Sudan. Churchill says they had by then killed all the people capable of running the country.