In March, 1862, with the 3d brigade, 1st division, 1st corps, Army of the Potomac, the regiment moved to Manassas; returned to Alexandria and embarked for the Peninsula; was engaged at West Point, with a loss of 67 killed, wounded or missing, and soon after was assigned to the 3d brigade, 1st division, 6th corps, with which it engaged in the Seven Days’ battles; then went into camp at Harrison’s landing until Aug. 16, when it returned to Alexandria. The regiment participated in the battles of Crampton’s Gap, Antietam and Fredericksburg; went into winter quarters at Belle Plain.