The Eleventh corps was still to occupy Cemetery Hill, just opposite the town. Upon a knoll to the right of the Eleventh corps was the First corps, and still farther, and forming the extreme right of the army, was the Twelfth corps, General Slocum. On the left of Cemetery Hill, occupying the extension of the ridge and a prominent hill, Round Top, the Third corps, General Sickles, was posted, and the Second corps, General Hancock. The Fifth corps was to be held in reserve until the arrival of the Sixth corps. Thus through the night, the two armies lay upon their arms, each watching the other, to wake to a contest more fearful than the last.
At daylight Thursday morning, July 2d, the rebel skirmishers opened fire upon parts of our lines of pickets, but there was little betokening any general engagement. Occasionally a few of the skirmishers of the enemy, would make a charge upon parts of our line forcing back the pickets, but a gun from some one of our batteries would hastily send them to the rear again. Doubtless it was for the purpose of disclosing the positions of our batteries, that their dashes were made. Thus the day wore on until four o'clock.
General Sickles, with the Third corps, had moved out beyond the general line of battle nearly a mile, and had come upon the advance of the enemy, where Longstreet, with one-third of the rebel army, was concentrating his forces against the left flank, with the hope of turning it and seizing the ridge.
The battle opened at once. Seven batteries of artillery opened upon front and flank of the exposed corps, and large bodies of infantry in column by division. The corps withstood the shock heroically, and was soon strengthened by troops from the Second corps. Our artillery now opened upon the rebels from the ridge, and hurled destruction upon them. The valley was filled with bursting missiles, and the smoke rolled up in huge columns. It was at this stage of the great battle that the Sixth corps arrived on the ground, after its unparalleled march, and the Fifth corps was at once ordered into the fight. For an hour the Sixth corps was the reserve of the army, but even this reserve was soon called into action.
The writer, while our corps waited for orders, rode along the front, from where the Second and Third corps were engaged in their deadly struggle with the enemy, across Cemetery Ridge and to the hill where, on the right of the line, Slocum had established his head-quarters, and he will attempt to describe the field as he saw it.
To form a correct idea of the position of the armies, one should imagine two ranges of hills, between which was the valley and the village of Gettysburgh.
These ridges are nearly parallel, and are from a mile to a mile and a half asunder. Their course is not a direct line but curving. The ridge on which our forces are posted, bend outward and backward, so that the line is in the form of a half circle, fronting from the center, while the rebels were forced to occupy an exterior line facing towards the center.
At Gettysburgh several roads converge, first, on the right is the Baltimore turnpike, next is the road to Taneytown, and further to the left is the Emmitsburgh road. These all meet at Cemetery Hill, which is the key to the whole situation.
Cemetery Hill is in the center of a range of hills running south and west from Gettysburgh, and considerably in front of the others. Standing upon its summit, the spectator looks down upon the village, a little to his right and upon the long declivity stretching between the crest and the town.
The crest of this ridge is bristling with batteries, which are so arranged as to sweep the declivity, the valley below, and the opposite range of hills. Here, by the side of the Baltimore pike, General Howard has his head-quarters, and just in front lie long lines of infantry, who wear the crescent badge, which distinguishes the Eleventh corps.