When the sultry first day of July drew to a close, the Federal right held Culp's Hill, the centre Cemetery Hill, the left was along Cemetery Ridge, and the reserve on the right. This line curved in the form of a horseshoe, with the projecting portion facing Gettysburg. Sedgwick, it will be remembered, had not arrived, but the force was composed of a hundred thousand veterans who had 200 cannon at command. That night the Confederates were in Gettysburg and a part of the country to the east and west. Ewell formed the left and held the town; Seminary Ridge was occupied by Hill's Corps, and confronted the centre and left of the Union line on Cemetery Ridge. When Pickett's division came up on the 3d, it was placed on the right of Hill's position and faced Round Top. Most of the succeeding day was spent by both armies in preparing for the tremendous death-grapple. At about five o'clock in the afternoon, having become convinced that the left and left centre of the Union line were the weakest points, Lee directed his efforts against them. They were held by Sickles, who made a blunder by advancing a portion of his force beyond the battle-line and seizing a ridge. It was because of this blunder that the first Confederate attack was made at that point. Longstreet and Ewell opened with a sharp cannonade, under cover of which Hood's division impetuously assaulted Sickles' left. He drove his right wing between Sickles left and Little Round Top, and was steadily succeeding in his purpose, when one of those apparently trifling things, for which no one can account, interfered and brought about momentous results. [Illustration: GEORGE G. MEADE. The Union commander-in-chief at Gettysburg.] Little Round Top was the key to the position, and yet it had no real defenders. Had Hood known this, he could have seized it without the slightest difficulty. Perceiving its importance, he began working his way toward it, and only some extraordinary interference could prevent it speedily falling into his possession. But General Gouverneur Warren, chief engineer, and his officers had climbed Little Round Top and were using it as a signal station. Soon the shots began flying so fast about them that they made hurried preparations to leave. Warren, however, saw the importance of holding the hill, and told his associates to make a pretense of doing so, while he looked around for a force to bring to the spot.