During the night information was received that Stonewall Jackson, having returned from his raid down the Valley of the Shenandoah, was rapidly moving down the peninsula between the Pamunkey and the Chickahominy with the intention of attacking McClellan’s right flank. This alarming intelligence put a stop, for a time, to any idea of an immediate advance toward Richmond. Our right wing consisted of the divisions of McCall, Morrell, and Sykes. At 12 o’clock on the morning of the 26th of June, the approach of the enemy was perceived. The position of the Union troops was a strong one; extending along the left bank of Beaver Dam Creek, the left resting on the Chickahominy, and the right in thick woods beyond the upper road from Mechanicsville to Coal Harbor. Seymour’s brigade held the left of the line; and Reynolds’ the right; the artillery occupied positions commanding the roads, and the open ground across the creek. At three o’clock in the afternoon the rebels advanced impetuously, but were bravely resisted by General Reynolds; and after a severe struggle forced back with heavy loss. A rapid artillery fire, with skirmishing, was maintained along the front, while the enemy about two hours later massed his troops for another effort, but was again repulsed with severe slaughter, by General Seymour. At nine o’clock, p. m., the engagement was at an end, with entire success to the Union arms, while the enemy retired slowly and humbled by defeat. During the night General Porter led a portion of the Union troops across the Chickahominy, Seymour’s brigade covering the movement; and in the darkness it was successfully accomplished. The enemy appeared in front of our new line about noon of the 27th, at which time we were prepared to receive him. In this engagement the rebels were two to one of the Union army; their force numbered seventy thousand; and that of the Federals thirty-five thousand. The loss of the latter under the tremendous fire of the enemy was appalling. At three o’clock in the afternoon the engagement had become so general and so severe that the whole second line and all the reserves were moved forward to meet the overwhelming number of the enemy, and to sustain the first line under the desperate assaults on the front. Slocum’s division was brought into action to guard the weak points of our line, the moment it arrived on the field. On the left the rebels were repulsed with heavy loss; while on the right Sykes’ regulars did signal service in repelling many severe attacks. The position of the Union troops was becoming very critical; and, most of them under arms for two days, and greatly exhausted, were being severely harassed by the masses of fresh troops constantly brought against them. To have the line pressed at any one point now, would have been fatal; and it was absolutely necessary, General Porter being required to hold his position till nightfall, to divide Slocum’s