History of Sudan association with the single largest political grouping, the [[National Umma Party Sudan|Umma Party]] (once led by a descendant of the Mahdi, [[Sadiq al Mahdi]]). Taking advantage of conditions resulting from Ottoman-Egyptian exploitation and maladministration, the Mahdi led a nationalist revolt culminating in the fall of [[Khartoum]] on 26 January 1885. The interim governor-general of the Sudan, the British Major-General [[Charles George Gordon]], and many of the fifty thousand inhabitants of Khartoum were massacred. The Mahdi died in June 1885. He was followed by [[Abdallahi ibn Muhammad]], known as the [[Caliph|Khalifa]], who began an expansion of Sudan's area into Ethiopia. Following
Frederick Hammersley (British Army officer) Frederick Hammersley (British Army officer) Major-General Frederick Hammersley, (1858 – 1924) was a senior British Army officer. Hammersley was the son of Major-General Frederick Hammersley (1824-1902) and Sarah Mary Ann (nėe Keating, 1826-1922). He joined the army and was commissioned a lieutenant in the Lancashire Fusiliers on 11 September 1876. He first saw service in the Nile Expedition of 1884-85 in the Sudan, was promoted to captain on 2 February 1885, received the brevet rank of major on 15 June 1885, and was confirmed in this rank on 9 September 1897. He fought at the Battle of Khartoum in 1898,