Two days later, "Dunkerque" and "Strasbourg" sortied to intercept reported German and Italian ships that were incorrectly reported to be in the area. The French had received faulty intelligence that had indicated that the Germans would attempt to force a group of battleships through the Strait of Gibraltar to strengthen the Italian fleet. After the French fleet got underway, reconnaissance aircraft reported spotting an enemy fleet steaming toward Gibraltar. Supposing the aircraft to have spotted the Italian battle fleet steaming to join the Germans, the French increased speed to intercept them, only to realize that the aircraft had in fact located the French fleet. The fleet then returned to port, marking the end of "Dunkerque"s last wartime operation. On 22 June, France surrendered to Germany following the Battle of France; during the truce negotiations, the French Navy proposed demilitarizing "Dunkerque" and several other warships in Toulon. Under the terms of the Armistice, "Dunkerque" and "Strasbourg" would remain at Mers-el-Kébir.