Please answer the following question: Information:  - Osman Digna(c. 1840  1926) was a follower of Muhammad Ahmad, the self-proclaimed Mahdi, in Sudan, who became his best known military commander during the Mahdist War. As the Mahdi's ablest general, he played an important role in the fate of General Charles George Gordon and the loss of the Sudan to Egypt. In Britain Osman became a notorious figure, both demonised as a savage and respected as a warrior. Winston Churchill describes him as an "astute" and "prudent" man, calling him "the celebrated, and perhaps immortal, Osman Digna."  - Muhammad Ahmad bin Abd Allah (Arabic:     ; August 12, 1844  June 22, 1885) was a religious leader of the Samaniyya order in Sudan who, on June 29, 1881, proclaimed himself the Mahdi, the messianic redeemer of the Islamic faith. His proclamation came during a period of widespread resentment among the Sudanese population towards the oppressive policies of the Turco-Egyptian rulers, and capitalized on the messianic beliefs popular among the various Sudanese religious sects of the time. More broadly, the Mahdiyya, as Muhammad Ahmad's movement was called, was influenced by earlier Mahdist movements in West Africa, as well as Wahhabism and other puritanical forms of Islamic revivalism that developed in reaction to the growing military and economic dominance of the European powers throughout the 19th century.  - Major General Charles George Gordon CB (28 January 1833  26 January 1885), also known as Chinese Gordon, Gordon Pasha, and Gordon of Khartoum, was a British Army officer and administrator.  - The Mahdist War (188199) was a British colonial war of the late 19th century, which was fought between the Mahdist Sudanese of the religious leader Muhammad Ahmad bin Abd Allah, who had proclaimed himself the "Mahdi" of Islam (the "Guided One"), and the forces of the Khedivate of Egypt, initially, and later the forces of Britain. Eighteen years of war resulted in the joint-rule state of the Anglo-Egyptian Sudan (18991956), a condominium of the British Empire and the Kingdom of Egypt.  - The Victoria Cross (VC) is the highest award of the United Kingdom honours system. It is awarded for gallantry "in the face of the enemy" to members of the British armed forces. It may be awarded posthumously. It was previously awarded to Commonwealth countries, most of which have established their own honours systems and no longer recommend British honours. It may be awarded to a person of any military rank in any service and to civilians under military command although no civilian has received the award since 1879. Since the first awards were presented by Queen Victoria in 1857, two thirds of all awards have been personally presented by the British monarch. These investitures are usually held at Buckingham Palace.  - Lieutenant General Sir Gerald Graham (27 June 1831  17 December 1899) was an English recipient of the Victoria Cross, the highest and most prestigious award for gallantry in the face of the enemy that can be awarded to British and Commonwealth forces.  - Egypt (; ', , "Kimi"), officially the Arab Republic of Egypt, is a transcontinental country spanning the northeast corner of Africa and southwest corner of Asia by a land bridge formed by the Sinai Peninsula. Egypt is a Mediterranean country bordered by the Gaza Strip and Israel to the northeast, the Gulf of Aqaba to the east, the Red Sea to the east and south, Sudan to the south, and Libya to the west. Across the Gulf of Aqaba lies Jordan, and across from the Sinai Peninsula lies Saudi Arabia, although Jordan and Saudi Arabia do not share a land border with Egypt. It is the world's only contiguous Afrasian nation.  - In Islamic eschatology, the Mahdi (ISO 233: "" "guided one") is the prophesied redeemer of Islam who will rule for five, seven, nine, or nineteen years (according to differing interpretations) before the Day of Judgment (/ literally, "the Day of Resurrection") and will rid the world of evil.  - Sir Winston Leonard Spencer-Churchill (30 November 187424 January 1965) was a British statesman who was the Prime Minister of the United Kingdom from 1940 to 1945 and again from 1951 to 1955. Churchill was also an officer in the British Army, a non-academic historian, a writer (as Winston S. Churchill), and an artist. He won the Nobel Prize in Literature in 1953 for his overall, lifetime body of work. In 1963, he was the first of only eight people to be made an honorary citizen of the United States.  - Sudan ("as-Sdn", ), also known as North Sudan and officially the Republic of the Sudan ("Jumhriyyat as-Sdn"), is a country in Northern Africa. It is bordered by Egypt to the north, the Red Sea, Eritrea, and Ethiopia to the east, South Sudan to the south, the Central African Republic to the southwest, Chad to the west and Libya to the northwest. It is the third largest country in Africa. The River Nile divides the country into eastern and western halves. Before the Sudanese Civil War, South Sudan was part of Sudan but broke away in 2011. Its predominant religion is Islam.  - The Battle of Tamai ( or Tamanieh ) took place on March 13 , 1884 between a British force under Sir Gerald Graham and a Mahdist Sudanese army led by Osman Digna . Despite his earlier victory at El Teb , Graham realised that Osman Digna 's force was far from broken and that he still enjoyed support among the local population . Accordingly , a second expedition departed from Suakin on 10 March in order to defeat the Mahdists definitively . The force was composed of the same units that had fought at El Teb : 4,500 men , with 22 guns and 6 machine guns . The Mahdists had roughly 10,000 men , most of them belonging to Osman Digna 's Hadendoa tribe ( known to British soldiers as `` Fuzzy Wuzzies '' for their unique hair ) .    What entity does 'battle of tamai' has the relation 'part of' with?
Answer:
mahdist war