The decisive moment of the battle, and perhaps of the whole war, was in the afternoon of the third day, when Lee sent forward his choicest troops in a last effort to break the middle of the Union line. The kernel of the attacking force was Pickett's division, the flower of the Virginian infantry, but many other brigades took part in the assault, and the attacking column, all told, numbered over fifteen thousand men. At the same time Longstreet's Confederate forces attacked the Union left to create a diversion. The attack was preceded by a terrific cannonade, Lee gathering one hundred and fifteen guns, and opening a terrible fire on the centre of the Union line. In response, the Union chief of artillery gathered eighty guns along on the crest of the gently sloping hill where attack was threatened. For two hours, from one to three, there was a terrific cannonade, and the batteries on both sides suffered severely. In both the Union and Confederate lines caissons were blown up by the fire, riderless horses dashed hither and thither, the dead lay in heaps, and throngs of wounded streamed to the rear. Every man lay down and sought what cover he could. It was evident that the Confederate cannonade was but a prelude to a great infantry attack, and at three o'clock Hunt, the Union chief of artillery, ordered the fire to stop, that the guns might cool to be ready for the coming assault. The Confederates thought that they had silenced the Union artillery, and for a few minutes their firing continued; then suddenly it ceased, and there was a lull. The men on the Union side who were not at the point directly menaced peered anxiously across the space between the lines to watch the next move, while the men in the divisions which it was certain were about to be assaulted lay hugging the ground and gripping their muskets, excited, but confident and resolute. They saw the smoke clouds rise slowly above the opposite crest, where the Confederate army lay, and the sunlight glinted again on the long line of brass and iron guns which had been hidden from view during the cannonade. In another moment, out of the lifting smoke there appeared, beautiful and terrible, the picked thousands of the Southern army advancing to the assault. They advanced in three lines, each over a mile long, and in perfect order. Pickett's Virginians held the centre, with on their left the North Carolinians of Pender and Pettigrew, and on their right the Alabama regiments of Wilcox; and there were also Georgian and Tennessee regiments in the attacking force. Pickett's division, however, was the only one able to press its charge home.