During the Second World War, Léon Blum, Georges Mandel, Édouard Daladier, Paul Reynaud and Maurice Gamelin were imprisoned in the castle in 1942 before their appearance at the Riom Trial.
On 16 June 1940 in Bordeaux, the British general Edward Spears, Churchill's military liaison officer, offered Mandel the chance to leave on his plane, together with Charles de Gaulle.
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During WWII, the Vichy regime arrested and interned Léon Blum, Édouard Daladier, Paul Reynaud, Georges Mandel and Maurice Gamelin as political prisoners at the fort.
The Massilia Deputies, a rump of 27 Assembly members, including Diouf, Édouard Daladier, Georges Mandel, Jean Zay, and Pierre Mendès-France, boarded the Massilia, a ship chartered to transport Assembly members to Casablanca, where they planned to set up a government in exile.