When Italy declared war on France on 10 June 1940 the corps was near the French-Italian border. The Italian Army only performed limited patrols and remained in its positions until after France had asked for an armistice on 20 June 1940. The next day the Italian divisions crossed the border in force, but stiff French resistance stopped them along the entire front after a few kilometres. During the campaign the corps commanded the 2nd Mountain Infantry Division "Sforzesca", 26th Mountain Infantry Division "Assietta" and 3rd Alpini Regiment.