Kammala jumla mai zuwa: Bayan Italiya ta shiga Yaƙin Duniya na II a watan Yunin 1940, "Trento" da "Trieste" sun ga manyan ayyuka a kan sojojin Burtaniya a Bahar Rum, gami da yaƙe-yaƙe na Calabria, Cape Spartivento, da
Cape Matapan a watan Yuli da Nuwamba 1940 da Maris 1941, bi da bi. A watan Nuwambar 1941, jirgin ruwa ya yi wa "Trieste" ruwa; ta shafe yawancin shekara mai zuwa a karkashin gyara. A halin yanzu, "Trento" ya kasance a lokacin yakin farko da na biyu na Sirte. Jirgin ruwan Italiya ya tashi don kai farmaki ga rundunar sojojin Birtaniya ta Operation Harpoon a watan Yunin 1942, kuma yayin da yake kan hanya, "Trento" ya yi garkuwa da shi sau biyu, da farko ta hanyar Bristol Beaufighter torpedo bomber sannan kuma ya nutse ta hanyar jirgin ruwa mai zurfi tare da asarar rayuka masu yawa a ranar 15 ga Yuni. "Trieste" an koma shi zuwa La Maddalena, Sardinia, inda daga baya aka nutsar da shi daga manyan bama-bamai na Amurka a ranar 10 ga Afrilu 1943.