What senior British Army officer known for his "scorched earth policy" experienced success in the British effort to re-conquer the sudan?
Battle of Omdurman:  It was a demonstration of the superiority of a highly disciplined army equipped with modern rifles, machine guns, and artillery over a force twice their size armed with older weapons, and marked the success of British efforts to re-conquer the Sudan. Herbert Kitchener, 1st Earl Kitchener: Field Marshal Horatio Herbert Kitchener, 1st Earl Kitchener, ( ; 24 June 1850 – 5 June 1916) was a senior British Army officer and colonial administrator who won notoriety for his imperial campaigns, most especially his scorched earth policy against the Boers and his establishment of concentration camps during the Second Boer War, and later played a central role in the early part of the First World War.
Herbert Kitchener