He had two older siblings, Marie-Maurille, Mademoiselle de Sombreuil, and Stanislas (both born in 1768).
Both Sombreuil's father and brother were executed by guillotine in July 1794.
In July 1795, Sombreuil helped lead the Quiberon expedition.
The invasion was a failure, and for betraying the Revolution he and 750 of his fellow soldiers were executed by firing squad.
This biographical article related to the French military is a stub.