Winston Churchill 
River War / An Account of the Reconquest of the Sudan 

"The River War" is a historical account of the reconquest of the Soudan (1899), by Winston Churchill, concerning his experiences as a British Army officer, during the Mahdist War (1881-99) in the Sudan. It is a history of the British imperial involvement in the Sudan, and the Mahdi War between the British forces, led by Lord Kitchener, and the Dervish forces, led by Khalifa Abdallahi ibn Muhammad, "The Mahdi", heir to the self-proclaimed Mahdi Muhammad Ahmad who had embarked on a campaign to conquer Egypt, to drive out the non-Muslim infidels. (Excerpt from Wikipedia)