Here let me state that according to the best information that I could get, I think a fair estimate of the Rebel force engaged in this battle would be a little upwards of a hundred thousand men of all arms. Of course we can’t now know, but there are reasonable data for this estimate. At all events there was no great disparity of numbers in the two opposing armies. We thought the enemy to be somewhat more numerous than we, and he probably was. But if ninety-five men should fight with a hundred and five, the latter would not always be victors—and slight numerical differences are of much less consequence in great bodies of men.

Skillful generalship and good fighting are the jewels of war. These concurring are difficult to overcome; and these, not numbers, must determine this battle.

During all the morning—and of the night, too—the skirmishers of the enemy had been confronting those of the Eleventh, First and Twelfth Corps. At the time of the fight of the First, he was seen in heavy force North of the town—he was believed to be now in the same neighborhood, in full force. But from the woody character of the country, and thereby the careful concealment of troops, which the Rebel is always sure to effect, during the early part of the morning almost nothing was actually seen by us of the invaders of the North. About nine o’clock in the morning, I should think, our glasses began to reveal them at the West and North-west of the town, a mile and a half away from our lines. They were moving towards our left, but the woods of Seminary Ridge so concealed them that we could not make out much of their movements. About this time some rifled guns in the Cemetery, at the left of the Eleventh Corps, opened fire—almost the first shots of any kind this morning—and when it was found they were firing at a Rebel line of skirmishers merely, that were advancing upon the left of that, and the right of the Second Corps, the officer in charge of the guns was ordered to cease firing, and was rebuked for having fired at all. These skirmishers soon engaged those at the right of the Second Corps, who stood their ground and were reinforced to make the line entirely secure. The Rebel skirmish line kept extending further and further to their right—toward our left. They would dash up close upon ours and sometimes drive them back a short distance, in turn to be repulsed themselves—and so they continued to do until their right was opposite the extreme left of the Third Corps. By these means they had ascertained the position and extent of our lines—but their own masses were still out of view. From the time that the firing commenced, as I have mentioned, it was kept up, among the skirmishers, until quite noon, often briskly; but with no definite results further than those mentioned, and with no considerable show of infantry on the part of the enemy to support. There was a farm house and outbuildings in front of the Third Division of the Second Corps, at which the skirmishers of the enemy had made a dash, and dislodged ours posted there, and from there their sharp shooters began to annoy our line of skirmishers and even the main line, with their long range rifles. I was up to the line, and a bullet from one of the rascals hid there, hissed by my cheek so close that I felt the movement of the air distinctly. And so I was not at all displeased when I saw one of our regiments go down and attack and capture the house and buildings and several prisoners, after a spirited little fight, and, by Gen. Hays’ order, burn the buildings to the ground. About noon the Signal Corps, from the top of Little Round Top, with their powerful glasses, and the cavalry at the extreme left, began to report the enemy in heavy force, making disposition of battle, to the West of Round Top, and opposite to the left of the Third Corps. Some few prisoners had been captured, some deserters from the enemy had come in, and from all sources, by this time, we had much important and reliable information of the enemy—of his disposition and apparent purposes. The Rebel infantry consisted of three Army Corps, each consisting of three Divisions, Longstreet, Ewell—the same whose leg Gibbons’ shell knocked off at Gainesville on the 28th of August last year—and A. P. Hill, each in the Rebel service having the rank of Lieutenant General, were the commanders of these Corps. Longstreet’s Division commanders were Hood, McLaws, and Pickett; Ewell’s were Rhodes, Early and Johnson, and Hill’s were Pender, Heth and Anderson. Stewart and Fitzhugh Lee commanded Divisions of the Rebel cavalry. The rank of these Division commands, I believe, was that of Major General. The Rebels had about as much artillery as we did; but we never have thought much of this arm in the hands of our adversaries. They have courage enough, but not the skill to handle it well. They generally fire far too high, and the ammunition is usually of a very inferior quality. And, of late, we have begun to despise the enemies’ cavalry too. It used to have enterprise and dash, but in the late cavalry contests ours have always been victor; and so now we think about all this chivalry is fit for is to steal a few of our mules occasionally, and their negro drivers. This army of the rebel infantry, however, is good—to deny this is useless. I never had any desire to—and if one should count up, it would possibly be found that they have gained more victories over us, than we have over them, and they will now, doubtless, fight well, even desperately. And it is not horses or cannon that will determine the result of this confronting of the two armies, but the men with the muskets must do it—the infantry must do the sharp work. So we watched all this posting of forces as closely as possible, for it was a matter of vital interest to us, and all information relating to it was hurried to the commander of the army. The Rebel line of battle was concave, bending around our own, with the extremities of the wings opposite to, or a little outside of ours. Longstreet’s Corps was upon their right; Hill’s in the center. These two Rebel Corps occupied the second or inferior ridge to the West of our position, as I have mentioned, with Hill’s left bending towards, and resting near the town, and Ewell’s was upon their left, his troops being in, and to the East of the town. This last Corps confronted our Twelfth, First, and the right of the Eleventh Corps. When I have said that ours was a good defensive position, this is equivalant to saying that that of the enemy was not a good offensive one; for these are relative terms, and cannot be both predicated of the respective positions of the two armies at the same time. The reasons that this was not a good offensive position, are the same already stated in favor of ours for defense. Excepting, occasionally, for a brief time, during some movement of troops, as when advancing to attack, their men and guns were kept constantly and carefully, by woods and inequalities of ground, out of our view.

Noon is past, one o’clock is past, and, save the skirmishing, that I have mentioned, and an occasional shot from our guns, at something or other, the nature of which the ones who fired it were ignorant, there was no fight yet. Our arms were still stacked, and the men were at ease. As I looked upon those interminable rows of muskets along the crests, and saw how cool and good spirited the men were, who were lounging about on the ground among them, I could not, and did not, have any fears as to the result of the battle. The storm was near, and we all knew it well enough by this time, which was to rain death upon these crests and down their slopes, and yet the men who could not, and would not escape it, were as calm and cheerful, generally, as if nothing unusual were about to happen. You see, these men were veterans, and had been in such places so often that they were accustomed to them. But I was well pleased with the tone of the men to-day—I could almost see the fore-shadowing of victory upon their faces, I thought. And I thought, too, as I had seen the mighty preparations go on to completion for this great conflict—the marshaling of these two hundred thousand men and the guns of the hosts, that now but a narrow valley divided, that to have been in such a battle, and to survive on the side of the victors, would be glorious. Oh, the world is most unchristian yet!

Somewhat after one o’clock P. M.—the skirmish firing had nearly ceased now—a movement of the Third Corps occurred, which I shall describe. I cannot conjecture the reason of this movement. From the position of the Third Corps, as I have mentioned, to the second ridge West, the distance is about a thousand yards, and there the Emmetsburg road runs near the crest of the ridge. Gen. Sickles commenced to advance his whole Corps, from the general line, straight to the front, with a view to occupy this second ridge, along, and near the road. What his purpose could have been is past conjecture. It was not ordered by Gen. Meade, as I heard him say, and he disapproved of it as soon as it was made known to him. Generals Hancock and Gibbon, as they saw the move in progress, criticized its propriety sharply, as I know, and foretold quite accurately what would be the result. I suppose the truth probably is that General Sickles supposed he was doing for the best; but he was neither born nor bred a soldier. But one can scarcely tell what may have been the motives of such a man—a politician, and some other things, exclusive of the Barton Key affair—a man after show and notoriety, and newspaper fame, and the adulation of the mob! O, there is a grave responsibility on those in whose hands are the lives of ten thousand men; and on those who put stars upon men’s shoulders, too! Bah! I kindle when I see some things that I have to see. But this move of the Third Corps was an important one—it developed the battle—the results of the move to the Corps itself we shall see. O, if this Corps had kept its strong position upon the crest, and supported by the rest of the army, had waited for the attack of the enemy!

It was magnificent to see those ten or twelve thousand men—they were good men—with their batteries, and some squadrons of cavalry upon the left flank, all in battle order, in several lines, with flags streaming, sweep steadily down the slope, across the valley, and up the next ascent, toward their destined position! From our position we could see it all. In advance Sickles pushed forward his heavy line of skirmishers, who drove back those of the enemy, across the Emmetsburg road, and thus cleared the way for the main body. The Third Corps now became the absorbing object of interest of all eyes. The Second Corps took arms, and the 1st Division of this Corps was ordered to be in readiness to support the Third Corps, should circumstances render support necessary. As the Third Corps was the extreme left of our line, as it advanced, if the enemy was assembling to the West of Round Top with a view to turn our left, as we had heard, there would be nothing between the left flank of the Corps and the enemy, and the enemy would be square upon its flank by the time it had attained the road. So when this advance line came near the Emmetsburg road, and we saw the squadrons of cavalry mentioned, come dashing back from their position as flankers, and the smoke of some guns, and we heard the reports away to Sickles left, anxiety became an element in our interest in these movements. The enemy opened slowly at first, and from long range; but he was square upon Sickles’ left flank. General Caldwell was ordered at once to put his Division—the 1st of the Second Corps, as mentioned—in motion, and to take post in the woods at the left slope of Round Top, in such a manner as to resist the enemy should he attempt to come around Sickles left and gain his rear. The Division moved as ordered, and disappeared from view in the woods, towards the point indicated at between two and three o’clock P. M., and the reserve brigade—the First, Col. Heath temporarily commanding—of the Second Division, was therefore moved up and occupied the position vacated by the Third Division. About the same time the Fifth Corps could be seen marching by the flank from its position on the Baltimore Pike, and in the opening of the woods heading for the same locality where the 1st Division of the Second Corps had gone. The Sixth Corps had now come up and was halted upon the Baltimore Pike. So the plot thickened. As the enemy opened upon Sickles with his batteries, some five or six in all, I suppose, firing slowly, Sickles with as many replied, and with much more spirit. The artillery fire became quite animated, soon; but the enemy was forced to withdraw his guns farther and farther away, and ours advanced upon him. It was not long before the cannonade ceased altogether, the enemy having retired out of range, and Sickles, having temporarily halted his command, pending this, moved forward again to the position he desired, or nearly that. It was now about five o’clock, and we shall soon see what Sickles gained by his move. First we hear more artillery firing upon Sickles’ left—the enemy seems to be opening again, and as we watch the Rebel batteries seem to be advancing there. The cannonade is soon opened again, and with great spirit upon both sides. The enemy’s batteries press those of Sickles, and pound the shot upon them, and this time they in turn begin to retire to position nearer the infantry. The enemy seem to be fearfully in earnest this time. And what is more ominous than the thunder or the shot of his advancing guns, this time, in the intervals between his batteries, far to Sickles’ left, appear the long lines and the columns of the Rebel infantry, now unmistakably moving out to the attack. The position of the Third Corps becomes at once one of great peril, and it is probable that its commander by this time began to realize his true situation. All was astir now on our crest. Generals and their Staffs were galloping hither and thither—the men were all in their places, and you might have heard the rattle of ten thousand ramrods as they drove home and “thugged” upon the little globes and cones of lead. As the enemy was advancing upon Sickles’ flank, he commenced a change, or at least a partial one, of front, by swinging back his left and throwing forward his right, in order that his lines might be parallel to those of his adversary, his batteries meantime doing what they could to check the enemy’s advance; but this movement was not completely executed before new Rebel batteries opened upon Sickles’ right flank—his former front—and in the same quarter appeared the Rebel infantry also. Now came the dreadful battle picture, of which we for a time could be but spectators. Upon the front and right flank of Sickles came sweeping the infantry of Longstreet and Hill. Hitherto there had been skirmishing and artillery practice—now the battle began; for amid the heavier smoke and larger tongues of flame of the batteries, now began to appear the countless flashes, and the long fiery sheets of the muskets, and the rattle of the volleys, mingled with the thunder of the guns. We see the long gray lines come sweeping down upon Sickles’ front, and mix with the battle smoke; now the same colors emerge from the bushes and orchards upon his right, and envelope his flank in the confusion of the conflict.

O, the din and the roar, and these thirty thousand Rebel wolf cries! What a hell is there down that valley!

These ten or twelve thousand men of the Third Corps fight well, but it soon becomes apparent that they must be swept from the field, or perish there where they are doing so well, so thick and overwhelming a storm of Rebel fire involves them. It was fearful to see, but these men, such as ever escape, must come from that conflict as best they can. To move down and support them with other troops is out of the question, for this would be to do as Sickles did, to relinquish a good position, and advance to a bad one. There is no other alternative—the Third Corps must fight itself out of its position of destruction! What was it ever put there for?

In the meantime some other dispositions must be made to meet the enemy, in the event that Sickles is overpowered. With this Corps out of the way, the enemy would be in a position to advance upon the line of the Second Corps, not in a line parallel with its front, but they would come obliquely from the left. To meet this contingency the left of the Second Division of the Second Corps is thrown back slightly, and two Regiments, the 15th Mass., Col. Ward, and the 82nd N. Y., Lieut. Col. Horton, are advanced down to the Emmetsburg road, to a favorable position nearer us than the fight has yet come, and some new batteries from the artillery reserve are posted upon the crest near the left of the Second Corps. This was all Gen. Gibbon could do. Other dispositions were made or were now being made upon the field, which I shall mention presently. The enemy is still giving Sickles fierce battle—or rather the Third Corps, for Sickles has been borne from the field minus one of his legs, and Gen. Birney now commands—and we of the Second Corps, a thousand yards away, with our guns and men are, and must be, still idle spectators of the fight.

The Rebel, as anticipated, tries to gain the left of the Third Corps, and for this purpose is now moving into the woods at the west of Round Top. We knew what he would find there. No sooner had the enemy gotten a considerable force into the woods mentioned, in the attempted execution of his purpose, than the roar of the conflict was heard there also. The Fifth Corps and the First Division of the Second were there at the right time, and promptly engaged him; and there, too, the battle soon became general and obstinate. Now the roar of battle has become twice the volume that it was before, and its range extends over more than twice the space. The Third Corps has been pressed back considerably, and the wounded are streaming to the rear by hundreds, but still the battle there goes on, with no considerable abatement on our part. The field of actual conflict extends now from a point to the front of the left of the Second Corps, away down to the front of Round Top, and the fight rages with the greatest fury. The fire of artillery and infantry and the yells of the Rebels fill the air with a mixture of hideous sounds. When the First Division of the Second Corps first engaged the enemy, for a time it was pressed back somewhat, but under the able and judicious management of Gen. Caldwell, and the support of the Fifth Corps, it speedily ceased to retrograde, and stood its ground; and then there followed a time, after the Fifth Corps became well engaged, when from appearances we hoped the troops already engaged would be able to check entirely, or repulse the further assault of the enemy. But fresh bodies of the Rebels continued to advance out of the woods to the front of the position of the Third Corps, and to swell the numbers of the assailants of this already hard pressed command. The men there begin to show signs of exhaustion—their ammunition must be nearly expended—they have now been fighting more than an hour, and against greatly superior numbers. From the sound of the firing at the extreme left, and the place where the smoke rises above the tree tops there, we know that the Fifth Corps is still steady, and holding its own there; and as we see the Sixth Corps now marching and near at hand to that point, we have no fears for the left—we have more apparent reason to fear for ourselves.