During the first few weeks of June 1808, Napoleon's troops had great difficulty in maintaining fluid communications between Madrid and Andalusia, mainly due to the activity of guerrilleros in the Sierra Morena. On 19 June, Vedel was ordered to head south from Toledo with a division of 6,000 men, 700 horse, and 12 guns to force a passage over the mountain range, hold the mountains from the guerrillas, and link up with General Dupont, pacifying Castile-La Mancha along the way. Vedel was joined during the march by small detachments under Generals Roize and Ligier-Belair. On 26 June 1808, Vedel's column defeated Valdecaños' detachment of Spanish regulars and guerrillas with six guns blocking the mountain pass of Puerta del Rey at Despeñaperros. Leaving a battalion at Puerta del Rey, Vedel met up with Dupont at La Carolina the following day, reestablishing military communications with Madrid after a month of disruption. Around midday on 16 July, Vedel moved from Guarromán to Bailén bringing up Legrange's cuirassiers, Cassagne's legion, and Dufour's brigade for an attack on Reding's troops. On the Spanish side, Reding deployed Coupigny's division to meet the threat, with an Irish battalion and two guns on a knoll leading up to the mountains; a regiment of regular troops, the Órdenes militares, at the San Cristóbalmonastery; militia in support; and the other battalions drawn up behind, in the centre. Two Spanish officers approached Vedel under a flag of truce, announcing that Dupont had been badly defeated and had proposed to suspend arms; the Frenchman replied, "Tell your General, that I care nothing about that, and that I am going to attack him." Vedel directed Cassagne's legion, supported by Boussart's dragoons, against the Irish position on the knoll. While Cassagne grappled the Irish, Boussard raced around the enemy flank and rear, trampled part of Coussigny's militia regiment, and enveloped the knoll. Their guns lost, the Irish battalion surrendered, and Vedel's men took the knoll and 1,500 prisoners. Dupont, having decided to call for a truce, negotiating terms with the Spanish officers over several days. After learning this, Vedel withdrew some distance along the highway, but Spanish commanders threatened to massacre Dupont's soldiers if Vedel did not also surrender. Following the capitulation of the French troops at the Battle of Bailén, Vedel, like the other high-ranking officers who were fortunate enough be returned to France, was sent before a court-martial, deprived of his rank and title, and imprisoned. He is buried at the Père Lachaise Cemetery in Paris.
