It was not therefore till nine in the evening of the eighteenth that the French general thought fit to move. After barricading and blocking up the bridge of Andujar--he dared not use gunpowder to destroy it for fear of rousing Castaños--he started on his night march. He had with him thirteen battalions of infantry and four and a half regiments of cavalry, with twenty-four guns, in all about 8,500 foot soldiers and 2,500 horse, allowing for the losses which he had sustained in sick and wounded during the earlier phases of the campaign[150]. His march was arranged as follows:--Chabert’s infantry brigade led the van: then came the great convoy: behind it were the four Swiss battalions under Colonel Schramm, which had lately been incorporated with the French army. These again were followed by Pannetier’s infantry brigade and Dupré’s two regiments of _chasseurs à cheval_. The rearguard followed at some distance: it was composed of two and a half regiments of heavy cavalry, placed under the command of General Privé, with the one veteran infantry battalion which the army possessed, the 500 Marines of the Guard, as also six _compagnies d’élite_ picked from the ‘legions of reserve.’ From the fact that Dupont placed his best troops in this quarter, it is evident that he expected to be fighting a rearguard action, with Castaños in pursuit, rather than to come into contact with Spanish troops drawn up across his line of march. He was ignorant that Reding and Coupigny had occupied Baylen on the previous day--a fact which speaks badly for his cavalry: with 2,500 horsemen about him, he ought to have known all that was going on in his neighbourhood. Probably the provisional regiments, which formed his whole mounted force, were incapable of good work in the way of scouting and reconnaissances. [150] Of the troops which we have recapitulated on page 182 there still remained with Dupont the whole of Barbou’s infantry, four of the five regiments of Frésia’s cavalry (the fifth had marched with Vedel), half of the 2nd Provisional Cuirassiers, and the two Swiss regiments of Reding and Preux. The original total of these corps had been 13,274. There remained about 11,000, for that number can be accounted for after the battle. The official Spanish dispatch gave 8,242 unwounded prisoners and 2,000 casualties.