Élysée Palace is associated in the account of the Dreyfus affair with a late-night political crisis described by Auguste Mercier: he claimed that he and Jean Casimir-Perier waited there until half past midnight while war with Germany seemed imminent. The scene matters less as a description of the building than as a contested explanation for why military authorities showed secret evidence to the judges who convicted Alfred Dreyfus.

The Palace in Mercier’s Account

During his testimony at the Rennes trial, Mercier invoked Élysée Palace while defending his decision to send secret documents to the court-martial that tried Dreyfus. He claimed that the controversy had brought France within a few moments of war with Germany, and that he had ordered Raoul de Boisdeffre to be ready to dispatch the telegrams that would trigger full mobilization. Mercier said he remained at the palace with Casimir-Perier until half past midnight, waiting to learn whether the German emperor would back down.

The account formed part of Mercier’s argument that the judges could not be left ignorant of the charges against Dreyfus. He said he had placed the secret documents in a sealed envelope and sent them to the president of the court-martial. The palace thus appears in testimony as the setting for the grave national emergency Mercier offered to justify that decision, not as a location independently described in detail.

A Disputed Recollection

Casimir-Perier was among the witnesses in court when Mercier recounted the supposed vigil at the palace. He rose to challenge Mercier’s account, but presiding judge Jouaust would not permit him to intervene. Casimir-Perier shook his head at the claim, prompting a sensation in the courtroom. The scene placed a direct contradiction beside Mercier’s dramatic invocation of imminent war: the former president’s presence gave the dispute a personal and public force, even though the court did not allow him to answer at that moment.

The Palace and the Secret Dossier

Mercier’s palace story connected an asserted danger of war to the handling of the secret dossier. In his testimony, the documents were presented as information the court-martial had to see because the national stakes were supposedly so high. Yet Mercier also said he had no confidence that proceedings behind closed doors could keep material from the press, while maintaining that he had sent the documents in a sealed envelope to the court’s president. The episode makes Élysée Palace part of the narrative’s conflict over secrecy: it anchors Mercier’s defense in a claimed emergency, while Casimir-Perier’s courtroom challenge leaves that account contested.