at 17:00 on 22 June. At Casablanca After arriving in Casablanca, Jean Bart had most of her anti-aircraft guns removed to strengthen the defenses of the port: the 90 mm and 37 mm guns were moved to the jetties protecting the harbor and two of the six 13.2 mm guns were put on trucks. Following their defeat in the Battle of France, the French signed the Armistice of 22 June 1940, ending their participation in the conflict. During the peace negotiations, the French proposed neutralizing Jean Bart and several other ships in Oran, French Algeria, but they ultimately agreed to take Jean Bart and Richelieu to Toulon to be demobilized. The Germans later decided against permitting the move, as they feared the British would try to seize the ship during the passage through the Strait of Gibraltar; the British, meanwhile, were under the mistaken impression that the Germans sought to seize the French fleet for their own use. This led to Operation Catapult, a series of attacks on French warships to neutralize vessels that would not defect to the Free French. The attacks prompted Ronarc'h to take precautions to protect his ship. He ordered the open barbettes for the secondary turrets and the incomplete superfiring turret covered with concrete, and much of the hull was sealed. He moved the ship to shallow water on 11 August. Eleven days later, CV Émile Barthes replaced Ronarc'h. In September work to ready the ship for combat as much as could be done with the limited material in Casablanca began. On 7 September, the ship received sixteen 13.2 mm guns and seventeen machine guns, though only one of the latter was actually installed as the light machine guns were of limited use. In 1941, an improvised director was fabricated using a torpedo tube platform removed from the old destroyer as a base for a rangefinder. For navigational purposes, a rangefinder was installed on the conning tower and two more were added to the bridge wings in October. The ship's anti-aircraft battery was strengthened in April 1942 with the addition of four 37 mm guns in single mounts and a pair of new twin 90 mm guns. By May, the forward main battery turret had been rendered fully operational and on 19 May, Jean Bart conducted test firing. The makeshift director did not work particularly well, so a triangulation system using observers aboard the ship