Our march during the night of the 11th was very tedious, on account of the extreme darkness and frequent showers of rain; but at daylight on the 12th the head of my column, under Wilson, reached the Mechanicsville pike.  Here Wilson, encountering the enemy’s works and batteries manned by General Bragg’s troops, endeavored to pass.  In this he failed, and as soon as I was notified that it was impracticable to reach Fair Oaks by passing between the works and the Chickahominy, Custer’s brigade was directed to make the crossing to the north side of the Chickahominy, at the Meadow bridge.  Custer moved rapidly for the bridge, but found it destroyed, and that the enemy’s cavalry was posted on the north side, in front of Mechanicsville.  When this information came back, I ordered Merritt to take his whole division and repair the bridge, instructing him that the crossing must be made at all hazards; for, in view of an impending attack by the enemy’s infantry in Richmond, it was necessary that I should have the bridge as a means of egress in case of serious disaster.

All the time that Merritt was occupied in this important duty, the enemy gave great annoyance to the working party by sweeping the bridge with a section of artillery and a fire from the supporting troops, so a small force was thrown across to drive them away.  When Merritt had passed two regiments over, they attacked, but were repulsed.  The work on the, bridge continued, however, not-withstanding this discomfiture; and when it was finished, Merritt crossed nearly all his division, dismounted, and again attacked the enemy, this time carrying the line, of temporary breastworks, built with logs and rails, and pursuing his broken troops toward Gaines’s Mills.

While Merritt was engaged in this affair, the Confederates advanced from behind their works at Richmond, and attacked Wilson and Gregg.  Wilson’s troops were driven back in some confusion at first; but Gregg, in anticipation of attack, had hidden a heavy line of dismounted men in a bushy ravine on his front, and when the enemy marched upon it, with much display and under the eye of the President of the Confederacy, this concealed line opened a destructive fire with repeating carbines; and at the same time the batteries of horse-artillery, under Captain Robinson, joining in the contest, belched forth shot and shell with fatal effect.  The galling fire caused the enemy to falter, and while still wavering Wilson rallied his men, and turning some of them against the right flank of the Confederates, broke their line, and compelled them to withdraw for security behind the heavy works thrown up for the defense of the city in 1862.