General Meade, as soon as it was ascertained that the rebels were encamped within full view of Gettysburg, set about making the required changes in the positions of his own troops. On Tuesday, June 30th, General Buford was sent, with a cavalry force numbering six thousand, to make a reconnoissance on the Chambersburg road. They encamped there for the night. Two corps were sent towards the southwest, to a point about four miles from Gettysburg, where they also encamped for the night. These corps were the First, numbering about eight thousand men, under command of General Reynolds; and the Eleventh, numbering nearly fifteen thousand, under command of General Howard. Two corps of the rebel forces, under Generals Hill and Longstreet, and two divisions of Ewell’s corps, were encamped quite near to the town of Gettysburg. The town of Gettysburg, itself, lies at the head of a gently sloping valley, and forms the centre for roads running north, south, east, and west.

The Catoctin and the South Mountain run on either sides of the valley; and a short distance to the east of the town runs the stream of water called Rock creek. Near the town are two hills, known respectively as Round Top, and Little Round Top, and on the former General Meade posted the extreme left of his line. To the northwest of this position, also on a slight eminence, General Lee had posted his men, forming a circular line of several miles in extent, and almost hemming in the patriot troops. On the morning of the following day a body of cavalry, under General Buford, was sent forward for reconnoitring purposes, and became engaged with the rebel advance immediately. General Reynolds followed, with his entire corps, and plunged into the thickest of the fight at the first sound of battle; the odds, however, were fearful—eight thousand against twenty thousand—and General Reynolds sent an urgent message to General Howard, to send forward reinforcements. But not till one o’clock did the Eleventh corps arrive to the assistance of the hard-pressed men, who still stood their ground like a rock, and fiercely drove back the advancing rebel hosts. General Reynolds riding up and down the line in front of his men, urging them on with look and word, fell a victim to his own dauntless bravery, being shot through the head by a rebel sharpshooter.

At last came two divisions of the Eleventh corps, under Schurtz and Barlow. Eager to retrieve their reputation, so tarnished at Chancellorsville, they formed bravely on the right, and stayed the faltering line, for the first time beginning to waver. The remaining division of the Eleventh corps, under General Steinwehr, was sent to occupy a point called Cemetery Hill, on the south side of the town.

For three hours longer the brave line continued to hold its ground against the ever increasing numbers of the enemy; but human endurance could bear no more, and at last the right wing slowly yielded, and then the whole line fell gradually back, in good order, to the town of Gettysburg. Here they fell a prey to the pursuing rebels, who overtook them in the turnings and twistings of the streets, and in a few minutes one thousand and twenty men became prisoners to the enemy. Now, indeed, the day looked dark for the Union soldiers; but at the very moment that all seemed lost, the artillery of the troops which had been sent to Cemetery Hill blazed forth a most unexpected check to the triumphant rebels. This saved the battle of Gettysburg from being lost to the National arms; the effect of the sudden firing was magical, and night, which now began to darken down around both friend and foe, put an end to the day’s battle.

The night following this day was one of anxious thought to the generals commanding the Union army; and in the Cemetery, among the monuments of the dead, many a prayer for reinforcements passed the lips of those who knew that certain destruction awaited them on the morrow, if more troops did not in the mean time arrive to their assistance.

But midnight brought relief and joy to those anxious waiting hearts. At about twelve o’clock the Twelfth corps, under General Slocum, and the Third, under General Sickles, arrived, fresh and eager for the battle. And soon after daylight came further reinforcements of the Second and Fifth corps; and the sun of the next day shone down on an almost entirely new army, which struck consternation to the hearts of the astonished rebels, who had already made up their minds to an easy and certain victory.

On this day the position of General Meade’s forces was as follows: General Howard, with the Eleventh corps, held the centre; the remaining portion of the First corps, and the Twelfth, under General Slocum, formed the right wing, and were placed on the right of the Baltimore road; the Second corps,—General Hancock,—and the Third,—General Sickles,—formed the army’s left wing, between the Taneytown and Emmetsburg roads.

On Thursday morning, the enemy, apparently surprised by the formidable Union army which they found ready to oppose them, remained strangely quiet during the most of the day; and it was four o’clock before they attacked the waiting and immovable line of Federal troops. Then indeed the crisis of the battle began. General Longstreet hurled his whole division upon the left wing of General Meade’s army, and the storm of artillery that plowed through the ranks, dealt swift and terrible destruction. But the brave Third corps, not even wavering before the dreadful fire, beat back the rebels again and again. On their left flank, danger now menaced them. Already one of Longstreet’s divisions was manœuvering to cut them off from Round Top Hill, on which were placed but three or four batteries. The position would be of incalculable value to the rebels, who, by placing their batteries on the hill, could hurl shell upon the whole Union line. To save Round Top Hill was of the greatest moment to the National forces, who put forth almost superhuman efforts to beat back the approach of the enemy. Bravely, with unflinching front, the rebels marched up to the very mouths of the guns, to be blown into atoms, and hurled in horrible burnt, blackened, bleeding fragments through the air, their places instantly filled up by scores of others equally daring and reckless of life. Captain Bigelow, commanding the battery at the extreme left, held the hill, after losing many of his men, several artillerists, two sergeants, four of his guns, and being himself severely wounded in the thigh, until McGilway’s two batteries arrived to his assistance, and poured in an unflinching fire upon the enemy’s lines.

Below, at the base of the hill, the battle raged with even greater violence; but feeling that it would be lost if Round Top Hill were yielded, the brave Union men determined to die in its defence, or hold it to the end. On came the rebels with their dreadful battle yell, as deafening as the roar of their artillery, and with fixed bayonets charged forward, a sea of gleaming, death-dealing, blood-stained steel, upon the noble, patriotic band, who met their attacks with unfaltering courage, and hand to hand fought them to the death, while the artillery rained a perfect torrent of shot and shell along the whole line. While this noble division, composed of Maine, Michigan, New York, and Pennsylvania regiments, all under command of General Barnes, were thus heroically resisting the rebels, the First division stood in danger of being completely swept away by the enemy’s advance. But now came General Ayres’ division, steadily marching forward, and with that indomitable bravery for which it was famed, and which had been displayed on previous battle-fields, poured down in resistless force upon the rebels, and saved the First division. Still harder pressed on the fight to obtain the coveted position on Round Top Hill; but the rebels were destined to defeat. General Meade sent orders to the Fourth and Fifth brigades of the Pennsylvania reserves to clear the hill of the enemy, and the movement began at once, superintended by General Crawford in person. Hastily forming his line General Crawford ordered a dash to be made, and the enemy was immediately driven back. One rebel brigade, under General Anderson, made a stand in a gap of the woods, but was fallen upon by a brigade under Colonel McCandless, and completely routed or taken prisoners. The Union men pressed on after the retreating rebels, and drove them back headlong and in wild confusion through the valley and into the woods beyond. Returning then to the hill so bravely fought for, and won with the blood of heroes, the Fourth and Fifth brigades took up their position there and held it to the close of the fight.

Great credit is given to General Crawford for his management of this affair. The honor of the army was saved by the brilliant action of the reserves. The loss of so many arms was entirely regained by this dash, and the ground upon which so many of the Union wounded lay without assistance, rescued from the enemy. Not one of the wounded had received the least assistance, and the groans of the suffering and dying men were terrible. Ambulances were immediately sent for, under orders of General Crawford, and the wounded were cared for.

In the mean time sharp and deadly fighting was going forward between the Eleventh corps, situated northeast of Cemetery Hill, and General Early’s division. As at Round Top on the day before, it was a hand-to-hand fight; the guns were so hot from the continuous shower of destruction that had thundered from their dreadful throats, that they could not be worked; but the rebels advanced over the cemetery wall, and leaped to the very mouths of the guns, but were beaten off with clubbed muskets. Before this unexpected resistance, they were compelled to fall suddenly back. The Twelfth corps was not so successful in beating off a similar attack made upon them, and the rebels gained a slight foothold, which would every hour become more valuable to them. But night had again fallen upon the combatants, and nothing further could be done to beat the enemy back. In the battle of Thursday, the losses on both sides were heavy. Of general officers, Brigadier-General Paul, and Brigadier-General Zook, were killed; and Generals Sickles, Barlow, Graham, and Warren, were wounded.

At earliest dawn of the following day, the battle was opened by a murderous fire from the National guns; and the fighting spread rapidly along the line. On the right, the Twelfth corps was already preparing to regain its losses of the previous evening; its rifle-pits bristled with rebel muskets, which were presently pouring out a deadly fire in return for the fierce attack of General Slocum’s men. But the brave Twelfth met the fire courageously, and their renewed strength was too much for the rebels, who, reluctantly began to fall back before them. The Union men pushed forward their advance, pressed back the rebels from their breastworks, and triumphantly taking up their lost position, the National line was again perfectly unbroken from end to end.

From this time till about eleven o’clock, the battle continued to rage with equal intensity and equal advantages or disadvantages to both sides; and then for a time a short, general quiet prevailed. It had already been proven by the battle of the previous day, that the final issue of the contest turned upon the occupation of Cemetery Hill; and, therefore, all General Lee’s ingenuity was exercised to obtain a clue to its capture, as all General Meade’s military skill was put in force to retain his valuable position. The rebel general had made preparations early in the morning for an attack upon Meade’s entire line; and he had also concentrated a large body of his troops against the Union centre, with the design of taking the ground it occupied. In other respects, as well, the rebel forces were skillfully and powerfully placed. The Union artillery on Cemetery Hill was subjected to a half-circle of cross fires, from the skillful arrangement of the enemy’s troops; General Longstreet having massed fifty-five guns of long range upon the brow of a slight eminence in front of General Hill’s extreme right, and General Hill had massed sixty guns along the hill, in front of the heights held by the National troops.

At one o’clock the signal gun was fired, and the cannonading commenced. The fire of the enemy was thus concentrated on the position held by the Eleventh and Second corps. It drew a most terrific response from the Federal batteries. It is thus described by a spectator in the Union army:

“The storm broke upon us so suddenly that soldiers and officers—who leaped, as it began, from their tents, or from lazy siestas on the grass—were stricken in their rising with mortal wounds, and died, some with cigars between their teeth, some with pieces of food in their fingers, and one at least—a pale young German, from Pennsylvania—with a miniature of his sister in his hands. Horses fell, shrieking such awful cries as Cooper told of, and writhing themselves about in hopeless agony. The boards of fences, scattered by explosion, flew in splinters through the air. The earth, torn up in clouds, blinded the eyes of hurrying men; and through the branches of the trees and among the gravestones of the cemetery a shower of destruction crashed ceaselessly. As, with hundreds of others, I groped through this tempest of death for the shelter of the bluff, an old man, a private in a company belonging to the Twenty-fourth Michigan, was struck, scarcely ten feet away, by a cannon ball, which tore through him, extorting such a low, intense cry of mortal pain as I pray God I may never again hear. The hill, which seemed alone devoted to this rain of death, was clear in nearly all its unsheltered places within five minutes after the fire began.”

The same contest is thus described by an eye-witness in the Confederate army:

“I have never yet heard such tremendous artillery firing. The enemy must have had over one hundred guns, which, in addition to our one hundred and fifteen, made the air hideous with most discordant noise. The very earth shook beneath our feet, and the hills and rocks seemed to reel like a drunken man. For one hour and a half this most terrific fire was continued, during which time the shrieking of shell, the crash of fallen timbers, the fragments of rocks flying through the air, shattered from the cliffs by solid shot, the heavy mutterings from the valley between the opposing armies, the splash of bursting shrapnell, and the fierce neighing of wounded artillery horses, made a picture terribly grand and sublime, but which my pen utterly fails to describe. After the firing had continued for little more than an hour, the enemy’s guns began to slacken, and finally all were silenced save some six or eight, which were in a clump of woods a little to the left of the stone fence.”

For three hours the firing had continued steadily; suddenly the Union fire was slackened for a moment to allow the guns to cool, when the enemy, supposing they had been silenced, prepared to make a final and irresistible attack. Their storming party was moved up. The division of General Pickett, which had arrived since the previous day, led the advance, supported on the right by General Wilcox’s brigade of General Anderson’s division, and on the left by Heath’s division, commanded by General Pettigrew. The troops of General Pickett’s division advanced in splendid order. On his left, the command of General Pettigrew emerged from the woods, and swept down the slope of the hill to the valley beneath, and some two or three hundred yards in the rear of General Pickett.

The Union line met the advance bravely. As they came under the fire of the First and Second Corps, the enemy’s batteries became suddenly silent. Their ammunition was exhausted. But still the rebel advance pressed boldly forward, never wavering, even when a fire of grape and shell was opened upon them. Steadily they crossed the Emmetsburg road, and with undaunted front approached the Union infantry, who quietly awaited their advance. General Gibbon, in command of the Second Corps, walking composedly along the front of his line, encouraged his men with his calm and steady voice:

“Hold your fire, boys—they are not near enough yet,” he called out almost loud enough for the advancing rebels to hear, who, still coming steadily onward, suddenly charged bayonets, and rushed forward on the rifle pits. Then from the Union line flashed a blaze of fire before which hundreds fell to the earth; but their comrades filled up the vacant spaces, and charged over the pits. Now General Gibbon called to his men to fall to the rear of the batteries, and without any sign of confusion, the order was obeyed. But General Pettigrew’s brave division no longer remained steady and unbroken; the artillery pouring in upon them a blasting and destroying fire, had scattered their ranks in wild confusion; and completely panic-stricken they fled over the plain, and far to the rear. General Pickett was now left to bear the whole strength of the Union forces alone, his officers wounded and falling around him on every side. Further resistance was worse than useless, and the rebel general gave the order to fall back. The Unionists pressed them strongly, but their retreat was successfully effected under cover of a brigade commanded by General Wright, and sent forward for that purpose by General Lee.

While this fierce attack was being resisted, and utterly repulsed by General Gibbon’s corps, the extreme right and left had been severely tried by the rebels under Generals Ewell and Longstreet; but on every side they were beaten back, and the night ended in the complete success of the National arms, and the glorious victory of Gettysburg. During the whole of the next day, both armies were engaged in the mournful duty of burying their dead, and caring for their wounded. The losses upon both sides during these three days were very heavy. That of the National army in killed was two thousand eight hundred and thirty-four; in wounded, thirteen thousand seven hundred and ninety; in missing, six thousand, six hundred and forty-three. That of the rebels in killed, wounded, and prisoners, was much greater. The Union soldiers buried four thousand five hundred of the rebel dead. They estimated their entire killed at about one thousand more; their wounded numbered twenty-one thousand; and their loss in prisoners, stragglers, and deserters numbered thirteen thousand.

During all day of the 4th of July, General Lee sent forward such of his wounded as would bear removal, to Hagerstown; and when night fell the entire remnant of his army was put in motion on the road to Fairfield. On the 6th General Lee reached Hagerstown, and took up position there with his army. On the following day General Meade’s advance in hot pursuit of the rebel army, reached Funktown, a place six miles south of Hagerstown. On the 8th a sharp conflict took place at Boonsboro’ between the retreating rebels and the pursuing Federal troops. The opposing forces were the Union cavalry under General Buford and General Kilpatrick; and the divisions under Generals Stuart, Hampton, and Jones, together with a division of infantry.

General Kilpatrick’s division was encamped in the immediate vicinity of the town. General Buford, who was posted about two miles in advance, was attacked by the enemy about eleven o’clock in the morning. General Kilpatrick immediately moved out to the front, and, relieving the brigades of Merritt and Devin, engaged the rebels.

The Union horse artillery was planted upon a very commanding position, and was served with great effectiveness.

The enemy’s infantry pressed the National line so closely that it was compelled to fall back, though the retrograde movement was made very slowly, and the ground disputed inch by inch. The cavalry repeatedly charged the enemy, breaking his line and routing his cavalry; but the rebel infantry pressed so hard that it was at length determined to fall back upon Boonsboro’.

About night the Third division of the Eleventh corps arrived, when the Union cavalry dashed impetuously upon the enemy, and drove him three miles.

Day after day, the rebels continued to retreat, and were closely pursued by the Union soldiers; skirmishing, and occasionally sharp fighting, marked the whole line of retreat; and there was every appearance of a long, pitched battle, between the Union array and that of General Lee, before the latter could succeed in escaping with his troops across the Potomac, and back into Virginia.

At daybreak on the 10th, a fight was opened at Sharpsburg, between the Union and rebel armies, which lasted till six o’clock in the evening, and resulted in a victory to the Union arms. During the night, the town was evacuated by the rebels; Generals Lee, Longstreet, and Ewell, being the last of the rebels to leave the place. The enemy fell back toward Williamsport, and were pursued for several miles by the Federal troops.

The Army of the Potomac marched steadily on, till it was in sight of Lee’s entire army, which occupied a strong position on the heights, near a marsh, in front of Williamsport. During this, and many previous and subsequent days, there was continual skirmishing in all directions; and the great battle that now seemed imminent was most anxiously waited for by the Union forces, who were eager to be at work again.

On the morning of the 14th of July, to the unbounded astonishment of the whole of Meade’s army, it was ascertained that the rebels under General Lee had effected a most skillful retreat. Under cover of the darkness, they had withdrawn from Williamsport, and the whole force, together with all its trains, plunder, &c., had escaped across the Potomac. On the same day the Union troops occupied Williamsport and Falling Waters; capturing at the latter place, a brigade of infantry, fifteen hundred strong, two guns, two caissons, two battle flags, and a large number of small arms. A vigorous pursuit of the rebel army was immediately ordered; and on the 15th, Meade’s army pursued, overtook, and engaged the rear of the rebel army; but the enemy continued to make good his retreat, while the Unionists continued to follow closely, till on the 24th, the Union army again overtook the fugitives; and a battle on the north side of the Rappahannock appeared to be inevitable. But again the wily rebel general disappointed the brave Unionists, so eagerly awaiting an opportunity to engage and defeat his troops. During the night, General Lee again effected his escape from his pursuers, and reached Culpepper Court-House, before his movements were detected.

Active operations were now, for a time, at an end, with the Army of the Potomac. It occupied the same line on the Rappahannock, which it had held two months previous, and the wearied soldiers rested from the labors of their long and tiresome march, still wearing upon their brows the laurels they had won in General Meade’s successful if not brilliant campaign.