The track began to twist as the gradient of the slope increased, and Napoleon and his party came up with the battery of horse guns from the regiment of dragoons. They were stationary on the track, wheels wedged with rocks as the crews stood by and stamped their feet, hugging their arms about their chests, heads hunched down inside their greatcoats.At the head of the battery a team of horses was scrabbling for purchase on the icy surface, while men strained at the spokes of the wheels of a gun and limber. As Napoleon watched, they edged forward a few paces before one of the horses slipped and went down, dragging another with it. The limber and gun began to slither back down the track before a pair of sharp-witted gunners managed to slip some rocks behind the wheels and bring the transport to a sudden halt.

Napoleon reined in and called the commander of the battery over. He had to cup his hand to his mouth to make sure that his words were understood above the wind. ‘Captain, double your horse teams up.Take the first three guns to the top of the pass and then come back for the rest.’

‘Yes, sire.’ The captain saluted and turned away to carry out his orders.

Whilst the men of the battery began to harness additional horses to the first three guns, Napoleon realised that the rest of the wheeled vehicles travelling with the army would have to adopt the same procedure. Some of the heavier guns would even need three teams of horses to negotiate the track. With a sinking heart he realised that it would be impossible to clear the pass before sunset. He steered his horse round the men struggling with the leading gun and continued up the track, soon coming up with the rear of the column of dragoons. Now the wind was violently blasting down the hill. The riders had dismounted and were bent almost double as they drew their mounts on. As the imperial party reached the dragoons a sudden flurry of snow struck Napoleon a stinging blow in the face.The blizzard roared around him and he felt the horse buffeted back a pace by the force of the wind. Then it lost its footing and staggered to one side, scrabbling for purchase on the icy ground. As it began to pitch over Napoleon released the reins, kicked his feet free of the stirrups and hurled himself to the side. He plunged into a drift in front of a large boulder and fetched up hard against the rocky surface, driving the air from his lungs.

‘Sire!’ the commander of the escort called out in alarm, dropping from his saddle and running through the snow towards him. Napoleon was gasping for breath and could not reply immediately as the officer leaned over him with a concerned expression. ‘Sire, are you injured? Do you need the surgeon?’