Meunier was promoted general of brigade on 8 January 1810. He directed the converged grenadier battalion of Jean François Leval's division at the Battle of Barrosa on 5 March 1811. The grenadiers were held in reserve and when the division was beaten, the grenadiers covered the retreat of the 54th Line Infantry Regiment. The source mistakenly identified Meunier as a colonel. On 1 March 1812, Meunier led the 1st Brigade in Nicolas François Conroux's 1st Division of Marshal Jean-de-Dieu Soult's Army of the South. The brigade included two battalions of the 9th Light Infantry Regiment and three battalions of the 24th Line Infantry Regiment. Together with Georges Alexis Mocquery's 2nd Brigade (96th Line), the division numbered 182 officers and 5,263 men. Soon afterward, he traveled to Paris where his father-in-law painted his portrait. He then joined the army preparing to invade Russia.