At its formation, the "Grande Armée" comprised seven army corps, the Imperial Guard, the artillery reserve, and the Cavalry Reserve. The latter consisted of two cuirassier, one light cavalry, and five dragoon divisions, including one dismounted. The mass of 22,000 cavalrymen was supported by 24 pieces of artillery, while the remainder of the army's cavalry was distributed among the army corps in brigades or divisions. Napoleon appointed Marshal Joachim Murat to command the Reserve Cavalry. Generals Étienne Marie Antoine Champion de Nansouty and Jean-Joseph Ange d'Hautpoul led the cuirassier divisions while Generals Louis Klein, Frédéric Henri Walther, Marc Antoine de Beaumont, and François Antoine Louis Bourcier headed the dragoon divisions and General Louis Baraguey d'Hilliers commanded the dismounted unit. On 8 October 1805, at the Battle of Wertingen, Murat and Marshal Jean Lannes attacked an isolated Austrian division under General Franz Xaver von Auffenberg. Murat's horsemen included Klein's 3,000-strong dragoon division, Beaumont's 2,400-man dragoon division, and light cavalry brigades under Generals Antoine Lasalle and Anne-François-Charles Trelliard. With the support of some V Corps infantry, Murat's horsemen rode down the helpless Austrians, inflicting losses of 400 killed and wounded, 2,900 prisoners, six guns, and six flags. The French admitted 174 casualties.