Rubuta ci gaba don wannan sakin layi - Girmamawa da alƙawarin asirinsa ga Entente, Romania ta shiga yaƙin a watan Agusta 1916. "Flacăra" ta rufe tare da fitowar ta ƙarshe a ranar 13 ga Nuwamba na wannan shekarar, yayin da Bucharest ke shirin kewaye da Jamus
Ka yi haƙuri. Daga baya Banu ya tsere zuwa Paris, inda, daga watan Janairun 1918, ya shiga ma'aikatan darakta na mujallar "La Roumanie" (tare da Emil Fagure da Constantin Mille), suna yin kamfen a Faransanci don dalilin Babban Romania. Ya shiga tsakani kai tsaye don samun maganganun haɗin kai tare da Romania da aka kewaye daga Ernest Lavisse, Lucien Poincaré, da sauran masana kimiyya na Faransa, yayin da suke ƙoƙari ba tare da nasara ba don hana gwamnatin Romania yin shawarwari na zaman lafiya tare da Ƙungiyar Tsakiya.