The I Corps of the Grande Armée was a military unit that existed during the Napoleonic Wars. The corps was composed of troops in Imperial French service. The corps was formed in 1805 and Marshal Jean-Baptiste Bernadotte was appointed its commander. It fought at Austerlitz in 1805, Schleiz, Halle and Lübeck in 1806, and Mohrungen and Spanden in 1807. After Bernadotte was wounded at Spanden, Claude Victor-Perrin led the corps at Friedland where his tactics won him a marshal's baton. Victor continued to lead the I Corps in Spain where it was engaged at Uclés, Medellín, Alcantara, Talavera in 1809, the Siege of Cádiz beginning in 1810, and Barrosa in 1811.