He participated in the battles of Paardeberg and Driefontein as well as the relief of Kimberley and the capture of Bloemfontein and Pretoria. The result of Alderson's contribution in these campaigns was to be rewarded with confirmation as a brigadier general, appointment as a Companion of the Order of the Bath (CB) and to receive the ceremonial post of Aide-de-Camp to Queen Victoria (who died the same year). By 1901, Alderson's innovations had resulted in several victorious operations, and in July that year he was appointed Inspector General of Mounted infantry in the Natal District.