As the first of the Imperial Guard battalions reached the head of the artillery train the gunners handed the small supply of ready tools to the men and the sergeants directed them to begin cutting into the embankment beside the track. As more tools came forward other companies moved further up the route to work by the light of lanterns set up on posts by the engineers who had hurried forward from Jena. The air was filled with the thud of picks, the soft scrape of shovels and the grunts of the men labouring in the chilly night air. Napoleon walked slowly up and down the track for the next half-hour, offering encouragement, cajoling, and swapping greetings with his veterans. Then, satisfied that the work was well in hand, he passed the lantern to an artilleryman, climbed back on to his horse and made his way up the track towards the ridge.

He found Marshal Lannes and a handful of his officers on the knoll on the crest of the heights.They were staring out across the plateau to where the campfires of the Prussian army sprawled across the darkened landscape.

‘Any signs of movement?’ Napoleon asked as he slid down from his saddle.

‘No, sire.’

‘Any reinforcements?’

‘None that we have detected.’

‘That’s strange,’ Napoleon mused. ‘They know we’re here. They will want to concentrate their forces to make or meet any attack. Are you certain there’s been no sign of activity, no fresh columns arriving in the enemy camp?’

‘As certain as we can be, sire.’

Napoleon was still for a moment, and then shrugged. ‘Very well, then. That has to be the main Prussian force. And we have the enemy where we want him. The first thrust of the Grand Army will fix the Prussians on the plateau, while Davout and Bernadotte cross the Saale and march on to their flank and rear. If all goes well, they will crumble under assault from two directions and the day is ours.’

Lannes was silent for a moment before he responded.‘Assuming that is the entire Prussian army out there. What if the enemy has split his force, sire? What if there is another column we have not accounted for?’

‘Another column?’ Napoleon snorted dismissively.‘Why would there be another column? Why would the enemy divide his strength on the eve of battle? Not even the Prussians are that foolish, my dear Lannes.’

He turned away from the enemy and indicated an even stretch of ground a short distance from the crest of the ridge. ‘I’ll spend the rest of the night there. Have a fire made up, and then I want the first units of the Imperial Guard to take up position around the crest.’ Napoleon turned to the nearest of his staff officers. ‘See to it.’

‘At once, sire.’