He entered the Sardinian military service in 1784, but suffered imprisonment in 1792 for refusing to bear arms against the French Republic.
Beauchamp escaped to France, where he obtained a position in the office of the Minister of Police, and was assigned the surveillance of the press.
[1] Beauchamp commenced his Histoire de la Vendée et des Chouans (three volumes, Paris, 1806), which depicted the cruelties of the Fouché regime.
This book displeased the Emperor, and Beauchamp was banished to Rheims.
Under the Restoration, he received a pension and wrote for the Moniteur and the Gazette de France.