5924780 ?Horse Picket of Royal Horse Artillery - Getting ready for Attack on Colesberg?, 1899 circa (b/w photo) by Underwood & Underwood (c.1881-1940); National Army Museum, London; (add.info.: ?Horse Picket of Royal Horse Artillery - Getting ready for Attack on Colesberg?, 1899 circa. Stereoscopic photograph, Boer War, 1899 circa. The Royal Horse Artillery (RHA) had the task of giving artillery support to the cavalry. With its soldiers all riding into battle on horses, wagons or limbers, the RHA was able to keep up with the fast moving mounted units. From a box of 89 stereoscopic cards entitled, ?South African War through the Stereoscope Pt 2 Vol 1\', published by Underwood and Underwood, and produced by Works and Sun Sculpture Studios, 1900 circa.); by National Army Museum .