Kammala jumla mai zuwa: Jirgin ya ga babban aiki a lokacin Yaƙin Duniya na II, gami da yaƙe-yaƙe na Cape Spartivento da
Cape Matapan a watan Nuwamba 1940 da Maris 1941, bi da bi. An kuma yi amfani da "Trieste" don rakiyar jiragen ruwa don wadatar da sojojin Italiya a Arewacin Afirka; a lokacin daya daga cikin wadannan ayyukan a watan Nuwamba 1941, wani jirgin ruwa na Birtaniya ya yi masa rauni. A ranar 10 ga Afrilu, 1943, yayin da jirgin ya yi ruwa a La Maddalena, Sardinia, 'yan bam-bamai masu nauyi na Amurka sun kai masa hari kuma suka nutsar da shi. An yanke gininsa kuma an sake shi a shekarar 1950; Rundunar sojan ruwa ta Spain ta sayi jirgin a shekarar 1952, tare da shirin canza jirgin zuwa jirgin sama mai dauke da jirgin sama, kodayake shirin bai zo ba saboda karuwar farashin aikin. A ƙarshe an rabu da ita a shekara ta 1959.