Faatumu le fuaiupu lenei: I le na o le lima aso mulimuli ane ai, ina ua amata le Taua a le Boer, na tofia ai Knox e pule i le 13th Infantry Brigade i le faaauupegaina o le 6th Division i lalo o le taʻitaʻiga a le General Kelly-Kenny, lea na avea ma vaega o le South African Field Force. Ina ua mavae le fesoasoani mai i Kimberley, na auai ai o ia i le
I le Taua i Paardeberg iā Fepuari 1900, na manuʻa ai o ia i se fana i le fatafata. Iā Mati 1902, na tofia ai o ia e pule i le vaegaʻau a Bloemfontein i le Orange River Colony. Ina ua māeʻa le taua iā Iuni o lenā tausaga, na toe foʻi atu ai Knox i Peretania i le "SS Dunottar Castle", lea na taunuu i Southampton iā Iulai 1902. Mo ana tautua i le taimi o le taua, e tolu taimi na taʻua ai o ia i Despatches, na tuuina atu i le Queen's South Africa Medal ma le King's South Africa Medal, na siitia ai le tulaga maualuga o le Major General (faʻatulagaina i le aso 4 Tesema 1899), ma faʻaigoaina o le Knight Commander of the Order of the Bath (KCB) i le Aperila 1901 South Arica Honours list (o le faʻatonuga na tusia i le aso 29 Novema 1900, ma na faʻatoa faʻatupeina o ia ina ua toe foʻi i le fale, e King Edward VII i Buckingham Palace i le aso 24 Oketopa 1902).