The long line of Federal guns withheld their fire for some minutes, when they burst forth, answering the thunder of those on the opposite hill. An eye-witness declares that the whole sky seemed filled with screaming shells, whose sharp explosions, as they burst in mid-air, with the hurtling of the fragments, formed a running accompaniment to the deep, tremendous roar of the guns. Many of the Confederate shots went wild, passing over the Union army and plowing up the earth on the other side of Cemetery Ridge. But others were better aimed and burst among the Federal batteries, in one of which twenty-seven out of thirty-six horses were killed in ten minutes. The Confederate fire seemed to be concentrated upon one point between Cemetery Ridge and Little Round Top, near a clump of scrub oaks. Here the batteries were demolished and men and horses were slain by scores. The spot has been called "Bloody Angle." The Federal fire proved equally accurate and the destruction on Seminary Ridge was appalling. For nearly two hours the hills shook with the tremendous cannonading, when it gradually slackened and ceased. The Union army now prepared for the more deadly charge of infantry which it felt was sure to follow. They had not long to wait. As the cannon smoke drifted away from between the lines fifteen thousand of Longstreet's corps emerged in grand columns from the wooded crest of Seminary Ridge under the command of General Pickett on the right and General Pettigrew on the left. Longstreet had planned the attack with a view to passing around Round Top, and gaining it by flank and reverse attack, but Lee, when he came upon the scene a few moments after the final orders had been given, directed the advance to be made straight toward the Federal main position on Cemetery Ridge. The charge was one of the most daring in warfare. The distance to the Federal lines was a mile. For half the distance the troops marched gayly, with flying banners and glittering bayonets. Then came the burst of Federal cannon, and the Confederate ranks were torn with exploding shells. Pettigrew's columns began to waver, but the lines re-formed and marched on. When they came within musket-range, Hancock's infantry opened a terrific fire, but the valiant band only quickened its pace and returned the fire with volley after volley. Pettigrew's troops succumbed to the storm. For now the lines in blue were fast converging. Federal troops from all parts of the line now rushed to the aid of those in front of Pickett. The batteries which had been sending shell and solid shot changed their ammunition, and double charges of grape and canister were hurled into the column as it bravely pressed into the sea of flame. The Confederates came close to the Federal lines and paused to close their ranks. Each moment the fury of the storm from the Federal guns increased.