 Leopold III , King and commander in chief of the Belgian army , surrendered personally to German forces on 28 May , contrary to the advice of Pierlot 's government , having personally decided that the Allied cause was lost . His decision was fiercely criticized by the French Prime Minister , Paul Reynaud and by Pierlot in a radio broadcast on 28 June 1940 , where he declared Leopold 's decision to be " an event without precedent in history " . 
