Whakaotihia te rerenga e whai ake nei: I muri i te whiu ngawari i tana whenua mo te whakakorenga mo nga marama e ono, ka uru ano a Brunet ki te ope French i te Hui-tanguru 1870, me te iti noa iho o te koroheketanga. I te Pakanga Franco-Prussian o 1870-1871 i wehewehe ia i a ia ano i nga pakanga o
Ko Spicheren, ko Mars-la-Tour me Gravelotte. I mauheretia ia i te whakapae o Metz. I muri i te pakanga i whai waahi nui a Brunet hei mema o te ope taua o Versailles i te tukinga o te Paris Commune. I tae atu ia ki te Royal School of Military Engineering i te United Kingdom i Akuhata 1871, ana i muri mai i taua tau i whakawhiwhia ia ki te Légion d'honneur me te tohaina hei kaitohutohu o te puni ki te Minita o te Pakanga, a Ernest Courtot de Cissey.