Fiennes fought in the
North-West Rebellion in 1885, was stationed in
Egypt from 1888 to 1889, and took part in the expedition to
Mashonaland in 1890. He was commissioned into the
Queen's Own Oxfordshire Hussars in 1895, and promoted
lieutenant on 29 April 1899. Following the outbreak of the
Second Boer War in late 1899, Fiennes volunteered for service in
South Africa, and was commissioned as a lieutenant in the
Imperial Yeomanry on 3 February 1900, serving in the 40th (Oxfordshire) company of the 10th Battalion. He left London the same day on board the SS Montfort. He was promoted
captain in 1901,
major in 1905, and
lieutenant-colonel in 1918. He fought in
Flanders and the
Dardanelles during
World War I. ==Political career==