The gunner with the linstock lowered the smouldering end to the powder in a small paper cone poking into the vent. There was a brief flare, then a jet of flame and smoke billowed from the muzzle an instant before the booming report carried up the hill to Napoleon and his staff. A moment later the rest of the massed guns of the Grand Army opened fire with a deep rolling roar that filled the morning sky like thunder. Hundreds of plumes of flame and smoke spat from the muzzles of the French guns, and then roof tiles exploded off the buildings of Ulm to show where some of the shot had struck home. Those guns that had been ordered to direct their fire at the Austrian earthworks began to take their toll, gouts of soil bursting into the air as fascines and timber fortifications were battered down.The defenders soon returned fire and the French positions received their damage in turn. But such was the weight of the Grand Army’s fire that General Mack’s outlying batteries were gradually silenced as the morning wore on.The sun rose in the sky and the mist from the Danube cleared from the streets of Ulm, only to be replaced by a thick cloud of dust swirling up from the masonry being pounded to pieces by heavy iron shot.Thick banks of smoke hung over the artillery positions of both sides, making them fire blind as they trusted to the careful laying of the guns before the bombardment to stay on target.

The gun crews had been ordered to cease fire at noon, and within a few minutes of the hour the last of the guns had fallen silent. A short time later the Austrians gradually followed suit and the comparative silence and stillness that followed was initially unnerving to the men new to war. Those in the artillery batteries quickly took advantage of the break in the action to make quick repairs to their defences, and drag away damaged guns as well as the dead and injured.

Up on the hill, Napoleon was taking a light meal of cold chicken, bread and watered wine when his attention was drawn to an excited babble amongst his staff officers. Lowering the wicker basket that contained his makeshift lunch, he rose and turned to follow the direction of their gaze.A small party of horsemen had emerged from the Austrian lines.Two men carried trumpets and were repeatedly blowing the same shrill call as they crossed the open ground between the two armies. Another man carried a large white standard, which he waved from side to side to ensure that it was clearly seen by the wary French skirmishers.The party was led by an officer with a broad red sash over his shoulder, and several decorations glittered brilliantly on his chest.