Kammala jumla mai zuwa: A ranar 25 ga Afrilu 1940 an nada Brivonesi kwamandan rundunar sojan ruwa ta 5, wacce ta kunshi jiragen ruwa "Duilio" da "Andrea Doria", rawar da zai rike har zuwa 7 ga Nuwamba, 1941. Italiya ta shiga Yaƙin Duniya na II a ranar 10 ga Yuni, 1940, kuma Brivonesi ya umurci Rundunar Sojan Ruwa ta 5 a cikin ayyuka da yawa, gami da Yaƙin Calabria; sashinsa ya kuma shiga cikin
Yaƙin Taranto, inda "Duilio" aka yi wa torpedo kuma ya lalace sosai. A cikin wannan lokacin, Brivonesi kuma ya riƙe mukamin shugaban ma'aikatan Sojojin Ruwa na 1 na wasu watanni. Bayan barin umarnin na 5th Division a watan Nuwamba 1941, an sanya shi zuwa Supermarina a matsayin Sufeto na sojojin anti-submarine. Ya rike wannan ofishin har zuwa Afrilu 1943; a ranar 1 ga Janairu 1943 an daukaka shi zuwa Admiral. Tsakanin 1940 da 1942 shi ma memba ne na Kwamitin Shirye-shiryen Makamai na Naval da na Babban Kwamitin don daidaita ayyukan fasaha. A ranar 10 ga Afrilu 1943 an ba Brivonesi umurnin Ionian da Kudancin Adriatic Naval Department, tare da hedkwatar a Taranto.