While serving in the army of Adam Philippe, Comte de Custine on the Rhine River, Meynier was ordered to defend Königstein Fortress with a few soldiers.

When the Prussians summoned Meynier to surrender the place, he refused and put on such a display of bravado that his enemies did not dare to attack the tiny garrison.

Augustin Joseph Isambert's brigade included the 6th, 48th, and 105th Line Infantry Regiments and the Corrèze, Lot-et-Garonne, and Jura National Guard Battalions.

In addition, the cavalry regiments were regrouped under the command of Jean Claude Loubat de Bohan.

[5] A muster roll for Napoleon Bonaparte's Army of Italy on 9 April 1796 shows Meynier in command of one of two divisions in André Masséna's Advance Guard.

He considered Meynier, Pierre Dominique Garnier, and Raphaël de Casabianca as, "incapable; not fit to command a battalion in a war as active as this one.

Meynier's death occurred during the Allied blockade of Mainz, which lasted from 21 November 1813 and ended on 4 May 1814 after Emperor Napoleon's abdication.