To this end, Pisani, along with many other Maltese students, joined the Fascist party of Italy and the "Black shirt" (Camicie Nere) movement. This led him to participate in the Italian occupation of Kefalonia in Greece with the "Compagnia Speciale del Gruppo CC.NN. da sbarco della 50a Legione". He decided to get the Italian citizenship in 1940. In 1941 he was enrolled in the Italian Navy as a "Sottocapo Manipolo Milizia Artiglieria Marittima".