General Meade, who had selected his ground for the impending battle along the banks of Pipe Creek, and who at one o'clock P. M. was at Taneytown when the news of the fight, and the death of the brave Reynolds at Gettysburg, reached him, despatched General Hancock to the scene of conflict to take command, and to ascertain whether Gettysburg afforded better ground than that which had been selected. Hancock arrived at Cemetery Hill just as our broken lines were hastily and confusedly retreating from the village; our advance, however, had already taken this commanding position and was making some preparation for resistance. The newly arrived general began at once to order the forces which had been engaged and others which were occasionally arriving. He ordered the occupancy of Culp's Hill on our extreme right, and extended the lines to our left well up the high ground in the vicinity of Round Top, a rocky eminence about two miles from Gettysburg, and nearly equi-distant from the Emmitsburg and Taneytown roads. The line having been made as secure as possible, Hancock wrote to Meade that the position was excellent. His despatch had scarcely gone, when he was relieved by General Slocum, a ranking officer, and so, leaving the field, Hancock hastened to report in person to his chief the condition of things at Gettysburg. On arriving, Meade informed him that he had decided to fight at Gettysburg, and had sent orders to the various commands to that effect; then together they rode to Gettysburg, arriving about eleven o'clock at night. All night long our forces were concentrating before this historic village, where they were all found on the morning of the second of July, except the Sixth Corps, General Sedgwick's, which did not arrive until two o'clock in the afternoon, after marching nearly all the previous night. SECOND DAY'S FIGHT.