Romualdi served as a soldier in the Italian Army in the campaigns in Ethiopia and during the Second World War in Greece and Albania, where he was an infantry captain. He returned to Italy in 1943 and became more prominent in political life with the foundation of the Italian Social Republic in 1943. Here he served as a delegate to the 1943 Congress of Verona and edited the "Gazzetta di Parma" newspaper. Shortly before the collapse of the Republic he was appointed vice-president of the PFR.