When the War of the Pyrenees ended in 1795, Quesnel transferred to the Army of the Coasts of Cherbourg. Its commander assigned him to the department of Manche. After the Coup of 18 Fructidor on 4 September 1797, Quesnel was denounced by the local Executive Commissioner for having connections with persons with counter-revolutionary leanings. The Minister of War asked the representatives for statements and confirmed that Quesnel's actions in the War in the Vendée were above reproach. However, Quesnel had come under suspicion because he married a noblewoman and socialized with persons believed to be loyal to the pre-coup government. Generals Pierre Augereau and Louis Lemoine both attested to his good conduct while fighting against the Spanish and the Vendée rebels. As a result of the inquiry, the authorities decided to transfer Quesnel to the 13th Military Division.