Tuhia he haere tonu mō tēnei wāhanga - I te 26 o Hānuere 1939, i whakawhiwhia a Miller ki te tūranga tuarua ki roto i te Welsh Guards, ā, i whakawhiwhia ki a ia te tau 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 Cross Military (MC) i te marama o Tihema 1944, i a ia e mahi ana hei rangatira matua mo tetahi kamupene i te 1st Battalion, Welsh Guards, me te kii, "i te rohe o te raki o te uru o Uropi o nga mahi
"I muri i te rā D, i te aroaro o te pupuhi nui, i pupuri ia i ana tangata e whakapaea ana, e whakaatu tonu ana i a ia ki te ahi a te hoariri, me te tino whakahawea ki tona oranga".