By this time General Heintzelman had arrived with his corps; and orders were given to fall back to a third line. The enemy made one more desperate attempt to crush the retreating division, but they were repulsed with fearful loss, and here commenced the turning of the tide in the conflict.

The line of battle as now formed was nearly two miles in the rear of the position of the morning, at Fair Oaks.

Heintzelman's and Keyes' corps at once proceeded to strengthen this position, and before dark the brave fellows of Sedgwick's division, of Sumner's corps, were on the ground, ready to assist in repelling the progress of the enemy. Richardson's division, not far behind, arrived at sunset; and now the Union army was prepared for any attempt which the rebels might see fit to make. The efforts which the enemy were now making to break through our flank on the left at White Oak Swamp, were, by this timely arrival of Sedgwick, thwarted. Had the confederates succeeded in this, the retreat of Keyes' corps and that part of Heintzelman's on the ground must have been cut off, and our army destroyed. The rebels, not satisfied with a partial victory, and determined to destroy the left wing of our army, then thrust beyond the river, renewed their assaults, and again and again pushed forward. Gathering in masses under cover of the forest, they would dash upon our lines with impetuous fury; only to be sent reeling back by a hurricane of leaden and iron hail. Sedgwick and the intrepid Kearney fought their divisions with greatest skill; and by their own example animated and encouraged their men. Night closed upon the scene; and at eight o'clock the fighting had ceased. The rebels, so exultant at their success in the early part of the day, were now hopeless of turning their victory to any good account; for their last assaults had met with such terrible repulses, that to renew the attack in force in the morning, would be but a useless waste of life to them. Still, they held their ground, and on the morning of June 1st, made some demonstrations against parts of our line, which were gallantly met.

Finally, General Hooker, who here sustained the enviable reputation he had so nobly earned at Williamsburgh, led his command across the open space in front of our line, a space not more than one-fourth of a mile wide, beyond which the ground was interrupted by forests, to attack the enemy.

With quick and steady step, the well trained division advanced across the field, deploying to the right and left; and before half crossing the open space their pace was quickened to a run; constantly firing as they dashed forward on the enemy.

Presently the edge of the forest was reached; and here considerable opposition was met with; yet, after a moment's halt, the division again pushed forward into the woods. The din of arms was heard for a few moments, then the firing ceased, and our troops were in possession of the ground.

The rebels were, in their turn, now panic-stricken; and hundreds of them rushed back to the confederate capital, spreading the alarm, and declaring that the Yankees were about to walk into the city.

It was doubtless a sad mistake that this victory was not followed up. The rebels, who had greatly outnumbered us in the fight of the day before, were now themselves outnumbered. They had suffered severe repulses on the evening before, and on this day their rear-guard had been whipped by General Hooker.

A renewal of the attack in force on the part of the Union army would have probably resulted in the capture of the beleaguered city. As it was, the commander of the Union army was on the north side of the Chickahominy, many miles from the scene of action, and no order for a forward movement was given.

Such was the battle of Seven Pines or Fair Oaks. Fought for the most part, by a single division of less than six thousand men, against the combined forces of Longstreet, Hill, Smith and Huger; all under the immediate command of the Commander-in-Chief of the rebel army, General Johnston.