The Transvaal Horse Artillery was formed on 17 March 1904 as Lys' Volunteer Corps and was a regiment dependent on horse transport from the start. The regiment's name was changed six months later to the Transvaal Horse Artillery Volunteers, which it retained until 1911, when the present name was adopted. In 1913, the unit was embodied in the citizen force of the new Union Defence Forces as the 7th Citizen Battery.
The regiment was part of the Northern Force sent to invade German South-West Africa at the outbreak World War I. It first saw action in September 1914 at Sandfontein and later distinguished itself at Riet and Namutoni.
Volunteers from the Transvaal Horse Artillery also later fought as part of the South African Heavy Artillery in Palestine, Egypt and Europe.
Inter-war
In the inter-war period the regiment grew from a single battery to a three battery brigade; it was also mechanised by the introduction of trucks. During the 1922 Rand Rebellion the THA took part in the Battle of Brixton Bridge and in the clearing of Fordsburg. The unit was renumbered "3rd" in 1926, and reverted to the name Transvaal Horse Artillery in 1932. On the outbreak of World War II in 1939, it became the 3rd Field Brigade.
World War II
During World War II, the THA first saw action against the Italians in Abyssinia. The regiment's most memorable action during the war was during the battle of Sidi Rezegh in the Western Desert on 23 November 1941. As a part of 5 South African Infantry Brigade Group, the THA suffered considerable losses during heavy action which saw it firing over open sights at the panzers of the Afrika Korps. After the collapse of Tobruk in June 1942, the regiment lost its headquarters unit as well as its 8th and 9th batteries, except for one troop of 8th Battery. This troop, together with the Coldstream Guards, were the only units to drive out in formation. The remaining battery of the regiment was first attached to 7 Field Regiment and took part in the fighting at El Alamein in October 1942. It subsequently joined 4/22nd Field Regiment, South African Artillery and saw action throughout the Italian Campaign.
During the post-war period, the regiment was often mobilised with 7 South African Infantry Division's 72 Brigade, to take part in South Africa's Border War. The regiment was called up in 1976 for three months active service in Angola and South West Africa and followed this up with two months in the operational area in 1979. Other operations included:
Renaming
Due to the fact that military traditions in SA Army Reserve units reflected only those from the South African Defence Force and its predecessor, the Union Defence Force. The military traditions and history of indigenous African military formations and liberation armies involved in the freedom struggle were not reflected in SA Army Reserve units. A process of renaming units was undertaken in 2019 that the THA was renamed the Sandfontein Artillery Regiment “It was the aim of the name review process to address this omission in a balanced and innovative way.
Cap badge: a field gun in the centre, with the word "Transvaal" above it and the words "horse artillery" below, with a laurel branch on a curved scroll in between.
The Transvaal Horse Artillery was formally affiliated with the Honourable Artillery Company from 1937 to 1961 and then again from 1994 to the present.
