Clauzel took part in the Peninsular campaigns of 1810 and 1811, including the Torres Vedras campaign, and under Marmont he did excellent service in re-establishing the discipline, efficiency and mobility of the army, which had suffered severely in the retreat from Torres Vedras. In the 1812 Salamanca campaign, the result of Clauzel's work was shown in the marching powers of the French. At the Battle of Salamanca, Clauzel, who had succeeded to the command when Marmont was wounded, and had himself received a severe wound. After Clauzel took over command, his army was soundly defeated at the Battle of Salamanca. The retreat on Burgos was conducted by him so well that the pursuers failed to make the slightest impression, and had themselves in the end to retire from the Siege of Burgos (1812).