His father, who was anxious for his eldest son to see active service in the Anglo-Zulu War, had him transferred to the 2nd Battalion of the Royal Scots Fusiliers, and he was sent to South Africa to "avenge" the massacre at Isandlwana.
[1] Twisleton-Wykeham-Fiennes acted as secretary to Sir Henry Bulwer, then the Governor of Maritzburg, and accompanied the column that captured Sikukuni.
[1] On 2 June 1902, he was appointed Lieutenant-Colonel in command of the 3rd (Militia) Battalion of the Royal Scots Fusiliers,[4] based in Ayr.
[1][3] After retiring from the Army in 1899, Twisleton-Wykeham-Fiennes entered private industry, spending the next few years as a salesman for a well-known brewing firm.
[1] Twisleton-Wykeham-Fiennes married Marion Ruperta Murray, daughter of Major Robert Bartholomew Lawes, on 20 February 1884.