Napoleon watched as Ruffin’s division marched out of the fog and began to climb the road up to the pass.As the men passed the Emperor’s position they cheered and Napoleon made himself raise his hat in acknowledgement, provoking fresh cheers from soldiers delighted by the simple gesture.As they neared the pass, the division halted and began to deploy in line. Ahead of them the skirmishers fired the first shots of the day at the enemy’s light infantry, who were sheltering behind rocks and folds in the ground just ahead of their main position. Soon tiny puffs of smoke were blossoming across the slope. Napoleon watched the deployment with a growing sense of impatience, tapping the top of his boot with his riding crop. At length the drums rolled and the division edged forward. As soon as they came in sight of the Spanish guns the latter opened fire and the first balls tore through the French ranks, scattering bodies in all directions. Ruffin’s men continued on towards the line of enemy infantry, the units on each flank taking the heaviest casualties as they approached the Spanish batteries. Inevitably, the line began to bow as the men being pounded by artillery slowed down, and finally stopped a short distance in front of the battery opposite Napoleon.

‘Don’t just stand there,’ Napoleon muttered irritably. ‘Get moving . . .’

The flanking battalion had suffered too many casualties and the men refused to advance any further. As the officers and sergeants tried to urge them on, the soldiers loosed off their muskets at the Spanish guns, which were shielded by their earthworks. It was a futile gesture that did not ease the storm of shot tearing the battalion to pieces.Then the first of the men fell back, away from the guns. More followed, and then the entire battalion was retiring, some of the men running, not stopping until the guns were out of sight. A lone officer remained on the bloodied ground, surrounded by bodies. He raised his sword and shouted, trying to shame his men into re-joining the attack. Then, as Napoleon watched, a round shot cut him in half. His legs stood still for an instant, before buckling and collapsing amid the carnage.

‘Shit.’ Napoleon clenched his fists as he glared at the scattered men of the battalion, then at the Spanish battery. Some of the gun crews had climbed on top of the earthworks and were jeering at the Frenchmen.

‘Damn them!’ Napoleon growled. He turned angrily in his saddle and pointed at the captain of his escort.‘Take that battery for me! At the gallop! Now.’

The captain looked up the narrow track to the pass, where it crossed the open ground in front of the enemy line.

‘What are you waiting for?’ Napoleon snapped.