‘Forgotten?’ Napoleon exhaled irritably. ‘Who do they think sends the convoys of gold to keep them paid? Do I not make them plenty of awards for bravery and fine performances? Well?’

‘It is not enough. They need you to lead them. To fill their hearts with inspiration once again. Then we could be sure of crushing Wellington once and for all. After that the Spanish will give up the fight and we will have peace.’

Napoleon considered his brother’s words for a moment. He did not deny it was tempting to teach his marshals in Spain that the redcoats were not invincible, as some of them seemed inclined to believe. But then, defeating Wellington would hardly be an achievement worthy of him, he concluded.

‘Joseph, I cannot afford to leave Paris. There are matters here that demand my attention.’

‘More than settling the issue in Spain?’

‘Even more important than that.’ Napoleon turned and continued walking along the path between the flowerbeds, head down and hands clasped behind his back. He had grown heavy from taking too little exercise in the past year and after a moment the discomfort of his arms pressing round his portly body made him release his hands and fold them across his chest instead. Joseph took a few quick steps to resume his place at his brother’s side. They walked in silence for a moment, and the only sounds were the gravel that crunched under their boots, the occasional cry of a peacock, and the laughter and faint snatches of high-spirited conversation of the Empress and her coterie. High above, puffy clouds floated across the sky, serene and unblemished.

‘It is a fine day,’ Joseph said. ‘I had almost forgotten that a man could feel peace like this. It has been such a long time. I would give up the Spanish throne in an instant - if I was permitted to.’

‘You shall do no such thing,’ Napoleon responded without looking up. ‘I have already removed one brother from a throne. I dare not risk the same happening to another Bonaparte. You will remain in Spain, on the throne, and we will win the war there.’

‘And if we don’t win? If we can’t win? Then what? You would leave me there to be torn apart by the mob? Have you not read of what they do to the French officers they capture? Why, the bastards sawed one of our generals in half, and they boiled another alive. Can you imagine that?’ Joseph shook his head in horror. ‘We should cut our losses and abandon Spain completely. That’s my advice, brother.’

‘And that is why you are not Emperor,’ Napoleon replied curtly.‘You lack the necessary appreciation of the wider situation. Spain is but one theatre of war. However, what happens there influences the rest of Europe. If you fail me in Spain, then our enemies will be emboldened to defy us elsewhere.’