Rubuta ci gaba ga wannan sakin layi - Berthier ya ba da Grosbois ga 'yar'uwarsa kafin ya tafi soja da yakin duniya na 1 a ranar 1 ga Agusta 1914. Wani kyaftin din soja da kuma jagoran wani kamfani na chasseurs a lokacin yakin na uku na Aisne
, ya sami raunuka daga harbin harsashi a Fort de Condé-sur-Aisne kuma ya mutu daga gare su a ranar 30 ga Mayu 1918. Ba shi da wata matsala. An binne shi a Château de Grosbois kamar mahaifinsa da kakansa.