[5] Appreciated by cardinal André-Hercule de Fleury, his main achievement was the extension of the attributions of the gendarmerie in 1720, which he structured as a maréchaussée, with police duties throughout France.

He fell from grace due to the machinations of the Marquise de Prie, whose mother was Le Blanc's mistress.

[7] He was deposed from his position in 1723 and exiled to Brie, but after the death of the regent later that year, he became a casualty of the infighting between the Condean and Orleanist factions at court.

After the dismissal of the Duke of Bourbon as prime minister in 1726, Le Blanc was not only released, but returned to his previous position for a second term as Secretary of State for War.

"[10] Le Blanc married Madeleine Petit de Passy, the daughter of the president of the parlement of Metz.