Jacquinot received promotion to general of brigade on 10 March 1809. He received command of a brigade of cavalry in Montbrun's light cavalry division in the III Corps of Marshal Louis-Nicolas Davout. On 16 April he had 1,797 troopers under his command in the 1st, 2nd and 12th Chasseurs à Cheval Regiments. On 20 April, Napoleon formed for Marshal Jean Lannes a provisional corps made up of Jacquinot's detached brigade, two III Corps infantry divisions and two cuirassier divisions. In the Battle of Abensberg Lannes' corps drove the Austrian left wing back and inflicted losses of 2,700 killed and wounded and 4,000 captured on their foes. Jacquinot's brigade fought at the Battle of Raab on 14 June under Montbrun's command. On this occasion, it included the 7th Hussars in place of the 12th Chasseurs. During the battle, the divisions of Montbrun and Emmanuel Grouchy routed the Austrian left flank cavalry. Still in Montbrun's division, Jacquinot led his 1,219-strong brigade at the Battle of Wagram on 5–6 July where it formed part of the right wing cavalry under the orders of Davout. On the second day, Davout's cavalry gained the upper hand despite the intervention of the Austrian reserve cavalry personally led by Archduke Charles, Duke of Teschen.