During the siege of Yorktown, it was constantly employed in picket and other important duties. On the evacuation of that place by the rebels, it formed a part of Stoneman's advance in pursuit, and participated in the capture of Fort Magruder, at Williamsburg, saving a regiment that had been badly cut up by unwisely drawing upon it the fire of the fort at eight hundred yards distance. It continued with the advance of Stoneman during its operations on the Pamunky and Chickahominy Rivers, was the first to take possession of White House, took part in the battles of Mechanicsville and Seven Pines, and at Turkey Bend was detached with the 7th Massachusetts, to guard Turkey Bend Bridge, and remained there till Porter's corps crossed. After the Battle of Malvern Hill, when the army fell back to Harrison's Landing, the regiment was assigned to the rear as a cover. On the 5th of July, it was in position on the west side of James River, opposite City Point, occupied in throwing up breastworks. When the Army of the Potomac withdrew from the Peninsula, the Regiment proceeded to the vicinity of Yorktown, where it remained a week destroying earthworks, and August 29 it embarked for Alexandria, where it landed September 1.