A sudden breeze had picked up, swirling through the heads of the remaining clumps of rye in the fields that had been trampled the day before. The wind was cool and refreshing after the close stillness of the morning and early afternoon. A shadow engulfed the rearguard’s position and swallowed them up in its gloom. Then Arthur felt the first drop of rain strike his cheek.

‘Now we’re for it,’ Uxbridge muttered. ‘Après ça, le déluge.’

‘Very funny,’ Arthur commented. ‘But I suspect we’re in for a storm of a different kind any minute.’ Half a mile to the south there was a rise in the land where the Prince of Orange’s brigade had been mauled. The ground there and beyond was still bathed in brilliant sunshine. As Arthur watched, a lone figure on a white horse galloped on to the rise and halted to survey the British position. The grey coat and bulky bicorne hat were unmistakable and he heard Uxbridge take a sharp breath beside him.

‘By God, that’s him!’ Uxbridge exclaimed. ‘That’s Boney.’

‘Indeed,’ Arthur replied, struck by the drama of the vision before him. The contrast in light made the French Emperor seem much closer than he really was. Arthur watched as Bonaparte scrutinised the rearguard and then looked, it seemed, directly at Arthur, though he knew he must be virtually indistinguishable from his men in the gloom. More horsemen appeared, in gold-embroidered uniforms, and halted just behind Bonaparte as they too surveyed the silent men defending the crossroads.

‘Your grace!’ a voice called out, and Arthur turned to see Captain Mercer waving a hand to attract his attention.

‘What is it?’

Mercer pointed towards the distant horsemen. ‘I believe they might be in range for case shot, your grace. May I have your permission to fire?’

‘Why not?’ said Uxbridge eagerly. ‘Strike him down and the war is as good as over.’

Arthur stared at his enemy. Uxbridge was right. But there was the danger that Bonaparte’s death might well turn him into a martyr and provoke his men into a furious desire for revenge. He shook his head.

‘Save your powder to cover the retreat.’

‘Sir?’

‘Do as I order, Captain!’

Mercer turned away from his commander with a shrug and stared towards the enemy. Arthur was aware of a dull rumble and then he saw the flicker of red and white pennants as a squadron of enemy lancers appeared a short distance to the Emperor’s right. More lancers appeared, and then cuirassiers, as the rise filled with horsemen. At that moment there was a dazzling burst of white, followed instantly by a metallic crash of thunder, and the horses started in panic. Raindrops, small and hard like fowlshot, lashed down from the sky. The darkness abruptly engulfed the French cavalry and swept on as the storm burst over the countryside.