After World War I, Campioni was promoted to commander in 1919 and to captain-lieutenant in 1926. He led naval design programs at the weapons laboratory at La Spezia and became the Italian naval attaché to France in Paris. In 1929 he took command of the battleship "Caio Duilio". After leaving "Caio Duilio", he became chief of staff of the First Fleet embarked on the heavy cruiser "Trieste", and from May 1930 to May 1931 he served as commanding officer of the heavy cruiser "Trento".