 Nyorai kuenderera mberi kweiyi ndima - Cator akapiwa basa rechipiri muScotland Guards musi wa 9 Chikumi 1897, uye akasimudzirwa kuva lieutenant musi wa 17 Chivabvu 1899. Akashanda nebato rokutanga rehurumende yake muSouth Africa munguva yeHondo yechipiri yeBoer, uye akanga aripo muhondo yeBelmont, Modder River, uye Magersfontein muna 1899. Gore rakatevera, akatora chikamu mukufora kuenda kuBloemfontein nePretoria, hondo dzeDiamond Hill neBelfast, uye kufambira mberi kuenda kuKomatipoort. Pashure pokuguma kwehondo mukupera kwaMay 1902, Cator akadzokera kumusha nehurumende yake mu SS Tagus, iyo yakasvika kuSouthampton muna July. 