[2] Deciding on a career as a professional soldier, Twiss enlisted with the Devonshire Regiment as a second lieutenant in July 1901.
He was promoted to the rank of lieutenant in January 1904,[4] before being transferred to the British Indian Army in October 1905,[5] joining the 10th Jats.
[7] He made two appearances in first-class cricket for the Europeans against the Hindus and the Parsees in 1913–14 Bombay Presidency matches at Poona.
[9] He served in the First World War attached to the Dorset Regiment and was cited for the Distinguished Service Order in June 1916,[10] with promotion to the rank of major coming in the following month.
[11] Following the war, Twiss returned to the British Indian Army, retiring from active service in March 1920, at which point he was granted the rank of lieutenant colonel.