Taupin came to Spain as part of the 2nd Division under Marshal Jean-de-Dieu Soult. On 15 September 1810, he commanded a brigade in Bertrand Clausel's division of Junot's VIII Corps during the Battle of Bussaco. The 1,949-man brigade consisted of the 4th Battalions of the 15th Light, 46th Line, and 75th Line Infantry Regiments. The VIII Corps was part of Marshal André Masséna's Army of Portugal. While the French were engaged in the 1810 Siege of Ciudad Rodrigo Taupin vowed to shoot any French soldier that came into his brigade's area to forage for grain. During the invasion, Taupin's brigade was in the advance guard and began to pillage Coimbra as soon as that city was occupied. When other French officers complained, Junot refused to do anything. Taupin served throughout the 1810–11 invasion of Portugal.