Colonel Waters could not help flinching as the first of the enemy’s cannonballs struck the bell tower, causing a shower of masonry and dust to cascade down into the courtyard. Looking up the track, beyond over a thousand Frenchmen who were gathering to attack the convent, he could clearly make out the battery of light guns that had begun to fire on his position. Bright flashes and puffs of smoke followed by sharp cracks announced the arrival of more shot, and Waters saw a section of the convent’s wall explode into fragments, cutting down one of the redcoats sheltering behind it. The wall had been designed to keep prying eyes out, not to withstand the damage that could be inflicted by modern artillery. Unless something was done, the French guns would soon batter the walls down enough to provide a breach through which the waiting infantry could assault the convent. As Waters stared up at the French battery, he could see that they were sheltered from the British guns across the river by a rocky outcrop. It seemed that the French gunners would be able to continue their bombardment in safety.

With a sick feeling of inevitability in his stomach he climbed down from the tower and hurried across the courtyard to join the men defending the wall.

‘Keep your heads down, lads, or the frogs will blow them off !’

Some of the men chuckled nervously. Others, who had never faced enemy fire before, hunched down with terrified expressions and waited for the end.

There was a jarring crash close by and another section of the wall collapsed in a cloud of dust. Mercifully, none of the defenders were injured, but as the dust settled it revealed a large gap just three feet from the ground.The rubble either side of the wall provided an easy ramp up into the breach. With a sudden deep roll of drums and a rising cheer that echoed back from the towering cliffs, the French surged towards the wall.

‘Here they come, boys!’ Waters yelled. ‘Don’t let them get inside or we’re done for! Fire at will!’

Flame darted from the muzzles of the muskets along the wall, sending Frenchmen sprawling on to the stony ground, but the charge came on in a wave of blue uniforms and glinting bayonets. Waters jumped back into the courtyard as he saw a fresh wave of British troops enter the side gate.

‘Over here, lads!’ he called to them, waving desperately towards the breach. ‘At the double, damn you!’