Tuhia he tomokanga mō tēnei wāhanga - Mai i a Eton, ka uru a Grigg ki te ope taua o Ingarangi, ā, ka whakawhiwhia ki te tūranga tuarua ki te ope taua a tōna pāpā, te Grenadier Guards, i te tau 1943 i te wā o te Pakanga Tuarua o te Ao (1939<unk>1945). I a ia e mahi ana i te ope taua o Ingarangi, i mahi a Grigg hei rangatira mo te Tiaki i te Whare o St James me te Whare o Windsor, Berkshire, a, i kite ia i te mahi hei rangatira o te roopu i te 1st Battalion, Grenadier Guards, he waahanga o te 5th Guards Armoured Brigade o te Guards Armoured Division, ki te ope taua Tiamana i France me Belgium
He aha? I te mutunga o te pakanga, ka noho ia hei rangatira matauranga.