[73] Thirteen squadrons of the 4th, 14th, and 26th Dragoons, the 2nd and 10th Hussars, the 21st and 27th Chasseurs, and the Spanish light cavalry regiment of Juramentados. Mortier, to whom Soult had committed the conduct of the battle, showed great tactical skill. On reaching the line of the Gebora, infantry and cavalry poured across it without a moment’s delay; all the three fords of which the French knew proved to be practicable, though on the southernmost one, near the bridge, the infantry had to cross with the chilly water up to their waists. The order of battle was very simple: the right wing, composed of the whole of the cavalry, was to pass by the most northern ford and ascend the heights beyond the Spanish left. Arrived at the crest, one brigade was to push along it, and fall on the flank of the hostile line, while the other descended into the valley of the Caya, and charged into the Spanish camps, so placing itself directly in Mendizabal’s rear. Of the infantry three battalions (the 100th regiment) were to ascend the hillside in the gap between the fort of San Cristobal and the nearest Spanish camp, a gap which had been caused (as it will be remembered) by the withdrawal of the Spaniards from the southernmost heights under the stress of bombardment six days before. This column was to risk the fire of the fort, which it had to disregard, and fall on the hostile flank. Meanwhile the centre--very weak and composed only of six battalions of infantry (34th and 88th regiments)--was to attack the Spanish front, when the two turning movements were well developed. The San Cristobal heights are a most formidable position, two miles of smooth steep slopes with an altitude of 250-300 feet, overlooking the whole plain of the Gebora and with hardly any ‘dead ground’ in their sides. They form an excellent _glacis_ for an army in position ready to defend itself by its fire, for the assailant must come up the hill at a slow pace and utterly exposed. Cavalry could only climb at a walk, and with difficulty; but Mortier had sent all his horse far to the north, where they ascended, and partly crossed, the range at its lowest point, beyond the extreme flank of the enemy. Just at this moment the fog rose, and everything became visible. On gaining the heights unopposed, Briche’s light cavalry formed up across them, and commenced to move along the summit towards the Spanish left wing, while Latour-Maubourg, with three dragoon regiments, descended the reverse slope and moved towards the hostile camp, in front of which Butron’s Spanish horse and Madden’s Portuguese could be seen hastily arraying their squadrons.