Whakakiia te rerenga e whai ake nei: I te 26 o Hanuere 1939, i whakawhiwhia a Miller hei tuarua tuarua ki nga Kaitiaki o Welsh, a i whakawhiwhia ki te nama ratonga 85599. I mahi ia ki te British Expeditionary Force (BEF) i muri i te pakarutanga o te Pakanga Tuarua o te Ao i te Mahuru. I mahi ia ki te 1st Battalion o te pu, he waahanga o te 32nd Guards Brigade o Major General Allan Adair's Guards Armoured Division, he hoia maia ia i wehewehe i a ia i te pakanga, a i whakahonoretia mo tana maia i te wa o muri mai o te whakaekenga a Allied o Normandy i te Pipiri 1944. I whakawhiwhia ki a ia te Karauna o te Rōpū (MC) i te Hakihea 1944, i a ia e mahi ana hei rangatira matua i tetahi kamupene i te 1st Battalion, Welsh Guards, me te korero e kii ana, "i roto i te
I te rā D, i te aroaro o ngā whakapae nui, i pupuri tonu ia i ana tangata i te whakapae, i te whakapuaki tonu i a ia ki te pupuhi a te hoariri, me te tino whakahawea ki tōna oranga".