As part of the Italian I Corps, the Cagliari participated in the Italian invasion of France in June 1940. Initially (10 June 1940) staying on the border at the Mont Cenis--Rocciamelone line, the division have moved across border 15 June 1940, capturing , Sommet de la Nunda, Pas de la Beccia and Col de Sollières around Mont Cenis lake by 17 June 1940. On 21 June 1940 it reached the Arc river valley and started advancing to Bramans and Le Planey (on Ruisseau d'Étache stream), capturing both on 23 June 1940. Immediately attack was initiated to Val d'Ambin with the goal of Modane, but the Franco-Italian Armistice signed 24 June 1940 has stopped the Cagliary division short of this goal. The division remained in the Arc valley until the end of September, when it returned home to Italy.