Fr. Pielorz tells us about Eugene’s responsibility in the Seminary as a result of Napoleon’s actions:
Father Émery, a fearless defender of the Pope against the encroachments of the emperor, set the tone for the seminary. A furious Napoleon ordered him to leave the seminary in June of 1810 and on October 8, 1811 simply decreed the dissolution of the Society of Saint Sulpice. The directors were forced to leave the seminary before the end of 1811. As a result, the seminary became the diocesan seminary of Paris.
The departure of the directors brought on the appointment of their replacements. Fr. Jalabert, the vicar general of Paris, took direction of the seminary in hand. Among the most zealous of the seminarians, they chose the replacements for the other directors. So it was that… Abbé de Mazenod became master of ceremonies…. But he carried out his functions for only ten months, from January to October of 1812. At the beginning of November, he returned to Aix to take up his apostolate for the poor and the most abandoned souls.