Tuhia he tomokanga mo tenei irava - I uru a Guyot ki nga Pakanga o te Tuatoru me te Tuawha o te Whakawhanaunga me te Grande Armée, e mau ana i te mana o te rangatira o te roopu i roto i te roopu "chasseurs-à-cheval" o te kaitiaki me te maumahara mo te maia i te Austerlitz me Eylau. I whawhai ia i te Pakanga iti o Waren-Nossentin i te 1 o Noema 1806. He koronel i roto i te Imperial Guard i te 1807, i hangaia ia hei rangatira o te Emepaea i te tau e whai ake nei ka whakawhiwhia ki a ia he tūranga i roto i te kaitiaki marama o Lefebvre-Desnouettes, e whakahau ana i te kaitiaki o te Emepara i te wa poto o te pakanga i Spain. I te tau 1809, i muri i te pakanga toto o Aspern-Essling, i whakawhiwhia a Guyot ki te mahi rangatira o te kaitiaki "chasseurs-à-cheval" a e ono wiki i muri mai ka arahi ia i tetahi whakapae rongonui i te pakanga o Wagram. Mā tēnei mahi ka eke ia ki te tūranga o te rangatira. He Chamberlain o Emperor Napoleon I mai i te Poutu-te-rangi 1810, i tukuna ia ki Spain, i reira i whakatairangahia ai ia ki te rangatira o te wehenga i te tau 1811. I te wa o te pakanga a Ruhia me te Pakanga o te Ono o nga Whawhai, ka mahi a Guyot hei rangatira mo nga kaitiaki "chasseurs-à-cheval". I te pakanga o 1813 i Saxony, i whara ia i te pakanga o Lützen
I ārahi hoki ia i tētahi whakaekenga nui i te pakanga o Bautzen, i mua i tana whakarau i te pakanga o Kulm, i Akuhata. I tukuna i muri i te whakawhitinga o nga herehere, i uru a Guyot ki te pakanga nui o Leipzig, i mua i tana whakaingoatanga hei kaute o te Emepaea i te marama o Noema o taua tau. I te pakanga o 1814 i Parani i kite a Guyot i te ngakau o te mahi, e whakahau ana i nga hoia eke hoiho i La Rothière, Champaubert me Craonne.