Napoleon and Berthier mounted their horses and rode down the slope of the small hill towards the division in the centre of the line. The officers and sergeants had seen the dust rising around the dense mass of Mameluke horsemen and were already bellowing orders for their men to stand to and close up the formation. Napoleon reined in and called for a telescope. As he swung the glass to the right of the line he could not help swearing in astonishment at the speed with which the Mamelukes had moved to envelop the French right flank. Desaix’s and Reynier’s divisions were going to take the brunt of the enemy’s main assault and Napoleon could only hope that his generals and their men would hold their ground.This was a battle unlike any they had fought back in Europe. There would be no assaults in columns behind a screen of skirmishers. The French were on the defensive and had to trust in firepower and good discipline.

The distant roar of cannon fire drew Napoleon’s eye back to the extreme right of the French line where a powerful battery had been established in a small village. Through the lens the battlefield was foreshortened into a swirl of figures and smoke in tightly compressed planes. Then Napoleon saw the barrels of his guns belch smoke and flame as they cut down swathes of the enemy cavalry closing on them. An instant later his view was obscured by the Mamelukes as they charged the French divisions and converged on the gaps between the French squares. There was a distant roar as Desaix’s men poured volley fire into the flank of the horsemen riding past the side of their square. Then Reynier’s men joined in, before the sound of musket fire became more general, a continuous roar and crackle. The Mamelukes added to the growing din as they drew their horse pistols and fired into the dense masses of blue-coated infantry.

Napoleon made his way across to the right hand side of the centre formation to better observe the attack.A torrent of enemy cavalry had swept into the gap between Reynier’s division and the centre of the French line and now charged home, seemingly straight at Napoleon and his staff officers.

‘Fix bayonets!’ the colonel of the right flank brigade bellowed out to his men and there was a metallic rasp and rattle down the line as his men drew out the long blades and slid the sockets over the ends of their muskets. When his men were still again the colonel shouted the order to advance their weapons and the long line of bayonets rippled down, towards the oncoming Mamelukes.