Five days after Arthur had arrived in Coimbra the allied army began its march north towards Oporto. The soldiers stepped out cheerfully, despite the hard going along dusty tracks beneath a hot sun. Many of them had been at Vimeiro and had told the rest that they had nothing to worry about with ‘Old Nosey’ in command. Arthur was pleased with their mood and keen to get them into contact with the enemy whilst it lasted. An army may march on its stomach, he reflected, but it fed on victory just as surely. The allied army descended from the hills of Coimbra and crossed the rolling country towards the coast where Oporto lay two miles from the Atlantic Ocean, on the bank of the river Douro.

On the eleventh, the vanguard of the army clashed with the first French outposts, and after a day of skirmishing the enemy were forced to abandon the south bank of the river and retreat into Oporto. It was evening before Arthur and his staff arrived in the sprawl of buildings that formed the small township of Vila Nova on the south bank. As light troops and riflemen pressed through the winding streets towards the ancient bridge that crossed the river, Arthur made his way to a convent that overlooked the city on the far bank. Emerging on to the terrace of the convent, the British officers had a fine view across the Douro.

To the left, a quarter of a mile upstream, a pontoon bridge constructed by the French engineers stretched across the river. The enemy still held a strongly fortified position around the end of the bridge on the south bank. Puffs of musket smoke pricked out along the palisade and from loopholes in the nearest buildings as the French rearguard and the British skirmishers fought it out. On the other side of the bridge the city of Oporto rose up from the banks of the river.To the left of the bridge the bank was lower, but to the right the bank gave way to rocky cliffs that tumbled down towards the water. The French had taken the precaution of moving every boat that could be found on to the northern bank and placing them under guard.

It was clear to Arthur that the bridge had to be taken if he was to get his army across the Douro and liberate the city. It would be a bloody business, as the enemy was bound to cover the crossing with every cannon that could be spared. He had little doubt that the crossing could be forced, but at what cost?

Turning to survey the southern bank he saw that the hills behind the convent were high enough to overlook Oporto. Arthur summoned one of his staff officers.

‘Somerset, pass the word to the artillery train. I want three batteries of six-pounders placed up there. They can provide counter battery fire when we attempt to force the bridge tomorrow.’

‘Yes, sir.’