Thomas Harold Mortimer Green was born at Glamorgan, Wales on 24 April 1863 the son of the Rev. William Green and Mary M. Green. He was one of at least nine brothers and sisters. He attended King Williams College, Isle of Man.

Green was one of those exceptional Victorian soldiers like the great Hector McDonald or Frank Bourne of Rorke’s Drift fame who served as an enlisted man before receiving an officer’s commission. He served in the ranks from 24 April 1885 to 15 May 1888. The
circumstances of his commissioning have yet to come to light.

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His military career included active duty with the Chitral Relief Expedition in 1895 and duty along the North-West Frontier at Dargai and the Sampagha and Arhanga Valleys in 1895-97. 1895 India General Service Medal with three clasps: “Relief of Chitral – 1895”, “Tirah 1897-98”, and “Punjab Frontier 1897-98”.

During the Anglo-Boer War (1899-1902) he saw action in the Orange Free State, the Transvaal, Cape Colony, Johannesburg, and Pretoria and was severely wounded at Diamond Hill. He was entitled to the Queen’s South Africa Medal with four clasps: “Diamond Hill”, "Johannesburg”, “Orange Free State”, and “Cape Colony”, a well as the King’s South Africa Medal with two clasps: “South Africa – 1901” and “South Africa – 1902”.

Green received a Mention in Despatches on 10 September 1901 and was Gazetted a Member of the Distinguished Service Order "in recognition of services during operations in South Africa" on 27 September 1901.

2nd Lieutenant (Commissioned from the ranks) - 16 May 1888
Lieutenant - 1 May 1890
Captain - 1 January 1894
Adjutant 2/Notts & Derbyshire Regiment - 2 July 1895 to 1 January 1899
Major - 5 August 1907
Commandant Detention Barracks, Cape Town - 3 April 1907 to 23 August 1913
Governor, Military Prisons - 24 April 1913 to 2 June 1915
1st Class Governor, Military Prisons (Temporary) - 3 June 1918
Retired (as Lt. Col.) - 31 December 1919

Thomas H. M. Green married the former Kathleen Steel in 1908.

Thomas Harold Mortimer Green passed away at Battle, Sussex on 14 December 1944.

The above-signed cabinet photograph of Captain (later Major) Thomas Harold Mortimer Green of the Nottinghamshire & Derbyshire Regiment (Sherwood Foresters) is inscribed on the reverse by Captain Green to "Little Nath" and dated 1904 - a year or so after he was presented with his Distinguished Service Order in Hong Kong for services during the Anglo-Boer War in South Africa.

Cabinet Photograph (Trimmed)
M. Mumeya - Photographer
No. 8a, Queen's Road, Hong Kong
1904