Colonel Sandherr

Colonel Sandherr’s significance lies in the gap between what the intelligence service learned and what its officers chose to make of that knowledge. He was involved in obtaining and interpreting secret communications used in the case against Alfred Dreyfus, received a report that identified another possible source of the espionage clues, and kept the dossier after Auguste Mercier ordered it dispersed. His actions leave him neither merely a keeper of records nor a simple source of evidence: he helped create the conditions for suspicion, then retained the documentary machinery that later scrutiny would expose as weak and contradictory.

Intelligence work and the Dreyfus file

The surviving account places Colonel Sandherr at the centre of the General Staff’s handling of the secret file. After Alfred Dreyfus’s conviction, Auguste Mercier specifically ordered Sandherr to break it up: intercepted letters were to return to the archive and the commentaries were to be destroyed. Yet the file remained intact. When Georges Picquart asked why, Felix Gribelin said that Sandherr had told him to keep it safe. That instruction preserved material which, once Picquart examined it, proved less conclusive than its reputation suggested.

The dossier contained five documents, including a deposition by Major Henry that supplied background for his courtroom testimony. Its allegations described Alfred Dreyfus’s access to fortification plans and asserted that he could have passed them to the German Embassy in Paris. But the compilation offered circumstances and insinuation rather than a document or witness directly naming him as a traitor; its closest apparent link was the initial D. Sandherr’s preservation of the file therefore had an enduring consequence: it left a record available for inspection, but one that did not substantiate the certainty with which the case had been presented.

The telegram and a rejected answer

Sandherr’s role in the decoding of a message from the Italian military attaché shows how suspicion could shape an intelligence inquiry before the evidence was read. He had arranged for Alfred Dreyfus’s name to be leaked to newspapers as the identity of the arrested spy. When Panizzardi went to a telegraph office in the early hours, Sandherr inferred that the leak had prompted a message to Rome and pressed the Statistical Section to decipher it. He offered a way past the cipher’s difficulty: if the section could be assured that the message contained the word Dreyfus, its work would become possible.

The decoded message did not confirm his theory. Its sense was that, if Alfred Dreyfus had had no dealings with Panizzardi, the ambassador should issue an official denial to forestall press comment. Rather than accept that the message placed Panizzardi in the dark about Dreyfus, Sandherr insisted that the translation must be wrong and took the matter to higher levels. He also arranged for an agent to give Panizzardi unrelated information, prompting a second coded message containing technical terms. That message confirmed the original decryption. The procedure took nine days, from 2 to 11 November; the court-martial began on 19 December. The Statistical Section therefore knew for more than a month before the trial that the phrase that lowlife D could not refer to Alfred Dreyfus on the basis Sandherr had assumed, unless Panizzardi was deceiving his own superiors.

Reports that complicated the accusation

A separate intelligence record further unsettled the association between D and Alfred Dreyfus. In an April 1894 report addressed to Colonel Sandherr, Major Henry considered the identity of the agent said to have supplied the Germans and Italians with plans of Nice. Henry proposed Jacques Dubois, a printer with access to Ministry of War contract work, as the likely source of copies of fortification drawings. Henry reported that Dubois lacked access to classified material and that the plans he had supplied were publicly available; his recommendation was that no further action be taken. The report did not establish what Sandherr concluded from it, but its presence in a file addressed to him shows that the identification of D was not a settled matter pointing only toward Alfred Dreyfus.

The disparity between these records and the accusation against Dreyfus is central to Sandherr’s place in the narrative. He had helped secure a decoding that ran against the suspicion he wanted to test, yet the suspicion survived the verification. He also received a report offering a different explanation for the initial D. The record thus depicts intelligence not simply as information gathered, but as information whose meaning could be contested, resisted, and carried forward despite contrary indications.

Responsibility, illness, and institutional memory

When General Gonse later explained the failed investigation to Picquart, he described Sandherr as a sick man and associated him with a process that had not been handled professionally. This is Gonse’s retrospective characterization, not an account of Sandherr’s illness or its precise effects. It nevertheless places Sandherr among the officers whose conduct could be invoked to explain the original inquiry’s deficiencies, while the preserved file and the telegram episode give those deficiencies concrete form.

Sandherr’s afterlife in the case rests on this unresolved combination. He reportedly obeyed neither the instruction to disperse the dossier nor the evidentiary lesson of a verified telegram: in one instance, he kept the record; in the other, he resisted what the record said. His preservation of the file made later examination possible, but it did not undo the consequences of the earlier interpretation. Instead, the documents exposed how institutional certainty could outlast the evidence that had first been gathered to support it.