Rubuta ci gaba don wannan sakin layi - 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 Nuwamba 7, 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; Rukuninsa ya kuma shiga cikin Yaƙin Taranto
, inda "Duilio" aka torpedoed 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.