Nyorai kupfuurira kweiyi ndima - Gentry akapedza kudzidza paDuntroon muna 1919 uye akatumirwa kuNew Zealand Staff Corps. Akapihwa basa muBritish Indian Army kwemakore maviri, achishanda kuNorth-West Frontier panguva yeWaziristan mushandirapamwe uye Moplah kumukira
. Paakadzokera kuNew Zealand, akabata nzvimbo dzinoverengeka dzevashandi muCentral Military District uye akasimudzirwa kuva kaputeni muna 1926. Muna 1934 akatumirwa kuEngland kunosungirirwa kuCorps of Royal Engineers kwemwedzi gumi nemasere uye akapindawo makosi einjiniya. Ipapo akashanda paGeneral Headquarters muWellington semukuru wevashandi, mainjiniya, asati adzokera kuEngland kunopinda Staff College kuCamberley, akapedza kudzidza muna 1939.