Accused in 1894 of being the author of a letter (the note, or the slip) announcing to a foreign agent the sending of military documents, Dreyfus was tried in camera by a council of war which unanimously condemned him to deportation and military degradation. While he was serving his sentence on Devil’s Island, a review campaign was led by Senator Scheurer-Kestner, Lt. Col. Picquart and Dreyfus’s brother, accusing Commander Esterhazy. After two requests for review, Dreyfus' conviction was quashed in 1906. He was appointed squadron chief and decorated with the Legion of Honor. During the Great War, mobilized, he was assigned to the General Staff of the artillery of the entrenched camp of Paris, then in 1917 to a divisional artillery park