Kammala jumla mai zuwa: Daga Yuni 1940 zuwa Yuni 1941 Legnani, a matsayin kwamandan rundunar sojan ruwa ta 8, ya halarci yaƙe-yaƙe Calabria,
Taranto da Cape Matapan, kazalika da magance ayyukan Burtaniya "Hats" (29 ga Agusta-1 Satumba 1940) da "MB 5" (29 ga Satumba zuwa 2 ga Oktoba 1940), da nufin samar da Malta. Bayan ya bar umurnin na 8th Division, a ranar 10 ga Disamba, 1941 an nada shi kwamandan rundunar jiragen ruwa na Italiya (mai maye gurbin Admiral Mario Falangola), rawar da ya ci gaba bayan da aka ba shi mukamin Admiral a shekarar 1942. Ya jagoranci ayyukan jirgin ruwa na Italiya a cikin Bahar Rum har zuwa ranar 8 ga Satumba 1943 armistice; a wannan lokacin an kuma ba shi lambar yabo ta Iron Cross na biyu na Jamus, da kuma Officer's Cross na Sojan Sojan Savoy.