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 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.
Controversy
The year 1794 marks the downfall of Hentz's career as an influential French politician. Hentz was with the Western army from February to May where the tragic shootings in the Vendee were blamed on his "reckless zeal." Hentz left the Army of the Rhine after being accused of overzealous violence and the burning of the town of Kusel on 26 July 1794. He returned to Paris in August.
Work under Napoleon
Upon the death of Robespierre, he briefly fled to Germany under the assumed name of Charles Arnould but returned under the French Consulate. He became known for his work on the legislative committee specifically in compiling the "Code Napoleon".
Emigration to the United States
Upon the Bourbon Restoration in 1815, Hentz was ordered to leave France with his family within thirty days, otherwise he would be imprisoned for life. Nicolas Hentz and his family then sailed for the United States. He settled in Wilkes-Barre, Pennsylvania in Pennsylvania, where he appears in the 1830 census with his wife, Theresa, and one of his sons. He died after 1 July 1830. Before he died, he wrote a short treatise on "Danton, Robespierre and Marat" in which he maintained "Behold, these three men, who have been erected into a 'detestable triumvirate.' I have believed it my duty... to attempt to recover the fellow-citizens of my adopted country from the abyss of error into which the English ministry has plunged them."
Family
Hentz married Therese d'Aubree in France. They had two sons, Nicholas Richard Hentz and Nicolas Marcel. The latter was known in the United States under the name of Nicholas Marcellus Hentz, became a painter, professor and was one of the founders of the arachnology. He was educated at Harvard University, and taught at George Bancroft's Round Hill School in Northampton. On 30 September 1824 his son married the novelist Caroline Lee Whiting. The oldest son, Richard, was born in Metz in 1786. He served in the French Imperial Army before he fled with his father to the United States. Initially the family settled in Wilkes-Barre. In 1830, Richard moved with his family to Towanda, in Bradford County, and from there to Mobile, Alabama, where he and his wife Adelaide died in 1850.