As Arthur watched he nodded with satisfaction. His men were holding firm, and as long as they did, the French cavalry would be sacrificed to no purpose. The only anxiety Arthur had was that while his infantry was preoccupied, Bonaparte might be ordering up infantry and artillery to support the attack. If that happened then there was little that could be done to save the allied army. Threatened by cavalry they would be forced to remain in square, and thus provide perfect targets for the enemy’s cannon.

His train of thought was broken as one of his aides was thrown to the side by the impact of a bullet. With a groan the young officer fell from his saddle.

‘Get him to the dressing station!’ Somerset ordered a passing drummer boy, and the wounded officer was dragged away, towards the colours where the other members of the battalion’s band were treating the injured.

Some of the Frenchmen had realised the futility of trying to break into the squares and had sheathed their blades and taken out their horse pistols to fire at the infantry who had defied their initial charge. The last of the volleys had been fired and now the air was filled with a constant crackle as individual soldiers reloaded and fired. The smoke hanging over the squares was soon as dense as the thickest London fog and the enemy horsemen were little more than shadows. The bloom of muzzle flashes lit up the smoke all around, and above the sound of gunfire Arthur could hear the desperate cries of officers of both sides encouraging their men, as well as the cries of the wounded and the terrified whinnies of crippled horses.

For fully twenty minutes the enemy cavalry attempted to break into the squares, but each time one of Wellington’s men fell the body was dragged inside the square and the gap closed up and the formation remained as impregnable as before. Then Arthur was aware that the fire was fading away, and a voice cried out,‘They’re going! The Frogs are on the run, boys!’

A cheer went up, and spread from square to square. Arthur gestured to his staff to follow and trotted out of the square that had sheltered him, the infantry moving aside to let him by. He cupped a hand to his mouth and called out, ‘Gunners to your pieces!’