Contrarily to ranks, which are awarded by the army, the distinction of Marshal of France is awarded by a special law voted by the French Parliament. For this reason, it is impossible to demote a Marshal. The most famous case is Philippe Pétain, who was awarded the distinction of Marshal of France for his generalship in World War I, and who was stripped of other positions and titles after his trial for high treason due to his involvement with collaborationist Vichy France: due to the principle of separation of powers, the court that judged him did not have the power to cancel the law that had made him a Marshal in the first place.