Nyorai kupfuurira kweiyi ndima - Pana 26 January 1939, Miller akagadzwa somutevedzeri wechipiri muWelsh Guards, uye akapiwa nhamba yebasa ye85599. Akashanda neBritish Expeditionary Force (BEF) mushure mekutanga kweHondo Yenyika Yechipiri munaGunyana. Achishanda ne1st Battalion yechirongwa, chikamu che32nd Guards Brigade yeMajor General Allan Adair's Guards Armoured Division, aive musoja akashinga akazviratidza panguva yehondo, uye akaremekedzwa nekuda kweushingi hwake panguva uye mushure mekupinda kweAllied muNormandy munaJune 1944. Akapihwa Military Cross (MC) muna Zvita 1944, achishanda semukuru anotungamira kambani mu1st Battalion, maWelsh Guards, aine chirevo chinoti, "kuti kuNorth Western Europe nzvimbo yekuita
"Mushure meD-Day, mukutarisana nokuputika kukuru, akachengeta varume vake vakanga vakombwa vakabatana, achiramba achizviratidzira amene kumoto womuvengi, nokuregeredza kwakakwana nokuda kwokupona kwake".