[1] As a junior officer of republican tendencies, he was implicated in several plots (including that of Lunéville) during the July Monarchy.

[3] Exiled to England, Clément-Thomas returned to France after the amnesty of political offenders in 1837 and collaborated with the newspaper Le National, the organ of the "bourgeois Republican" majority.

[6] He was recognized and seized by the crowd, thrown on top of the corpse of General Claude Lecomte, who had been lynched a few minutes earlier, and he too was executed.

[11] There was even a 1908 activist theater production (entitled La Commune), which portrays a pseudo-trial of the two generals before their execution.

On 18 November 1871 a court-martial (le 6e Conseil de Guerre) handed down the death penalty to Simon Charles Mayer (1820 Nancy - 1887 Basel), major of the Paris Commune, for being responsible for the murder of the two generals Claude Lecomte, and Jacques Leonard Clement Thomas, in spite of weak evidence.