Pedzisa mutsara unotevera: Musi wa 26 Ndira 1939, Miller akagadzwa semutevedzeri wechipiri muWelsh Guards, uye akapiwa nhamba yebasa re85599. 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 achiraira kambani mu1st Battalion, maWelsh Guards, nekutaura kunoti, "kuti mu
North Western Europe theatre of operations, after D-Day, in face of heavy shelling, he kept his beleaguered men together, continually exposing himself to enemy fire, with complete disregard for his survival". "Mushure mokuparadzwa kweD-Day, akatarisana nekurwiswa kukuru, akaramba akabatana nevarume vake vakanga vakakombwa, achiramba achizviisa pamoto wevavengi, achiregeredza zvachose kupona kwake".