At the trial of King
Louis XVI in December 1792, he voted for the guilt of the king, the ratification of the judgment against the people, against the stay and for the death penalty. In the year 1793, he was sent as a
representative on mission to ensure the reform of the army and the military's compliance with the revolution. From April to July, he was sent as commissioner to the
Army of the Ardennes. He did not participate in elections relating to impeachment of
Jean-Paul Marat nor the conviction (and subsequent executions) of
Girondins such as
Georges Danton. From August to September, he was on a mission to the northern army, where he arrested General
Houchard, who he considered to be a "creature and successor of
Custine's" who had recently been accused of treason and executed. In October, another mission took him to the Western army; in November, he was back to the Army of the Ardennes and the Moselle and the North. He returned to Paris in late November 1793 and left immediately for the northern army, where he remained until mid-January 1794. Moreaux recognized the conduct of Saint-Cyr and Oudinot in his order of the day. On 10 June
National Convention deputy Nicolas Hentz insisted that Saint-Cyr be elevated to
general of brigade since he already commanded a brigade. When Saint-Cyr objected, the politician compelled him to accept the promotion by threatening to put him under police observation. Within a few days Hentz again promoted him to
general of division. Saint-Cyr gave the excuse that another general with the same family name, Louis-Jean-Baptiste Gouvion was in disgrace and that suspicion would fall on himself. Hentz overrode this objection saying, "Is it only that? Can a brave man like you be hindered from serving the Republic well because there is a rascal in his family? You shall be general of division. I will it!" Saint-Cyr's fears were well-founded. In 1793, the revolutionaries executed 17 generals and in 1794 the number rose to 67. Saint-Cyr was assigned command of the 2nd Division of the
Army of the Rhine while Oudinot received the rank of
general of brigade in the
Army of the Moselle. ==Work under Napoleon==