Following the outbreak of war, both
Rex and Conte di Savoia continued regular Mediterranean cruises as if totally unaffected by events to the north. In the end, Italian liners proved to be among the final ships trading on a commercial basis. Their voyages ceased in the spring of 1940 and they were returned to Italian ports for safekeeping, with Rex laid up at Genoa, but after the city was bombed, the Italian Line decided to move it to Trieste. To prevent German forces from using the liner to blockade the harbor entrance, Rex was moved near Pula, where she lay for some time.