Napoleon glanced round to see that all his officers were engaged now, locked in an uneven duel with the Cossacks as they jabbed their lances at any target that was presented to them. For their part the staff officers tried their best to parry the strikes and use the greater weight of their horses to force the enemy back, but they were outnumbered and were gradually driven into a tight knot around the Emperor. Napoleon had no pistols nor even a sword, and drew out his telescope, hefting it in his spare hand as he prepared to use it as a club. All around the air was thick with the scrape and clatter of blades on steel points and wooden shafts. The Cossacks had stopped their cheering and now focused intently on their hand-to-hand fight with their enemy, teeth locked in feral snarls. With a gasp, the first of Napoleon’s officers went down, falling from the saddle as the tip of a lance ripped from his stomach a bloody, glistening tangle of intestines. Almost at once he was joined by the Cossack who had struck him down as a sabre cut deep into the Russian’s neck, severing muscle and blood vessels and breaking through the spine. The man flung his arms out, spasmed in the saddle and fell.

‘Sire! Look out!’ Berthier yelled, urging his horse between Napoleon and the Cossack who had pressed through the ring behind them. Napoleon swung round to see the Russian’s wild expression as he drew back his lance to strike. The point came forward, foreshortened and deadly, like a snake striking, and Napoleon swept out his telescope, just managing to knock the point aside. Then the pony slammed into the flank of Napoleon’s mare, nearly knocking him out of his saddle. He swayed briefly before grimly tugging on his reins and clamping his legs round the horse’s girth. Berthier struck back, slashing his blade down on to the man’s shoulder, shattering the collar bone and shoulder blade with a sharp crack. The Cossack dropped his lance, snatched the reins aside with his good hand and raced away, barging between the men struggling around Napoleon.

‘Thank you, Berthier,’ Napoleon panted, his heart pounding with fear and excitement. Berthier smiled, then both men heard a distant trumpet note sounding across the fields. They turned and saw a squadron of Guard cavalry charging into view round a bend in the road.

‘Hold on!’ Napoleon shouted to his officers. ‘Hold them back!’