During the Italian invasion of France (11–25 June), he commanded the First Army, which was deployed along the southern sector of the Alps down to the coast. The first ten days of after Italy's declaration of war on France passed without any offensive movements by the Italians, and Pintor labelled it a "war without hostilities". On 20 June, he told Army Chief of Staff Mario Roatta that his army was "absolutely unprepared" for the offensive Prime Minister Benito Mussolini had demanded by the next morning. Mussolini, in response to Pintor, modified his plans, calling for a total offensive only along the northern stretch of the Alpine front. Afterwards, he was the president of the "Commissione Italiana d'Armistizio con la Francia" (CIAF), which oversaw the implementation of the Franco-Italian Armistice, from 27 June 1940 until his death.