‘They are not the only ones,’ Arthur replied wryly. ‘Be that as it may, my new instructions stand, and need to be passed back up the Navy’s chain of command. See that your captain is informed as soon as possible, Carstairs.’

‘Yes, sir.’

‘Now then, I expect you would appreciate something to eat, and a bed for the night. Somerset, have one of the clerks take the lieutenant to the staff officers’ mess.’

‘Yes, my lord.’ Somerset bowed his head and held the flap open for Carstairs. He returned a moment later and stood awkwardly by the entrance to the tent until Arthur looked up.

‘Is there anything else?’

‘Yes, my lord, since you ask. I am concerned by the supply situation. The men have rations for two days and we are already three days ahead of our supply convoys. They in turn are more than a hundred miles from our forward depot at Salamanca. We are already operating at the limit of our lines of supply.’

Arthur leaned back in his chair. ‘You heard what I said to that naval officer. You are privy to my strategic intentions, Somerset. Therefore you know that we are shifting our lines of communication to Santander, and, in due course, San Sebastian. There is nothing for you to be concerned about.’

‘Except that we have possession of neither of those ports, my lord.’

‘Not yet. We shall just have to take them.’

‘But we have no guarantee that we can take them,’ Somerset replied. ‘What if we fail to capture them, as we failed at Burgos, my lord?’

‘We - I - failed at Burgos for want of adequate siege artillery. As you know, our siege train is aboard a convoy anchored off Coruña. When the time comes, we will have the firepower necessary to reduce both ports, and then we shall have a direct supply route to England. Does that satisfy you, Somerset?’

‘Yes, my lord,’ Somerset replied reluctantly. He saluted formally and left the tent.

Arthur sighed and ran a hand through his cropped hair before turning his attention back to the map.

The army was less than a day’s march from Burgos and another two to the Ebro. The latest reports from the cavalry patrols revealed that the French were looking to defend the line of the Ebro. The enemy’s chief difficulty was that they could not be sure where the allied army was. All that was before them was Arthur’s cavalry screen and a division of Spanish troops. If the deception played out as Arthur hoped, then his army would be across the Ebro and threatening to cut Joseph and his army off from France before the French could react. The only course of action open to them would be to turn and fight. The decisive moment of the campaign would be attained, and all within a month of its beginning.