On the declaration of war on 3 September 1939, "Bévéziers" was sent to patrol the ports on the northern Spanish coastline, where part of the German commercial fleet had taken refuge, and were suspected of supplying German U-boats. At the beginning of October, the boat was sent with the 8th Division to the Antilles. The submarine then escorted two convoys, and from Halifax, Nova Scotia to Liverpool, returning to Brest on 20 April 1940. Following some repairs and refitting, the "Bévéziers" was sent to Casablanca, and was there when the armistice between France and Germany was concluded on 20 June 1940. The submarine then patrolled the Gulf of Guinea and returned to Dakar on 21 August 1940.