The 21st New Jersey Infantry Regiment lost 1 officer and 20 enlisted men killed or mortally wounded and 1 officer and 30 enlisted men to disease during the Civil War.

1862
Organized at Trenton, N.J. under Colonel Gilliam Van Houten
September 15 Mustered in
September 16 Left State for Washington, D.C.
September 18 Moved to Frederick, Md. and Joined Army of the Potomac on battlefield of Antietam, Md. Attached to 3rd Brigade, 2nd Division, 6th Army Corps, Army of the Potomac
September-October Duty at Hagerstown, Md., and guard duty at Dam No. 5
October 29-November 19 Movement to Falmouth, Va.
December 11-15
Battle of Fredericksburg
December 11 Cover laying of pontoons and Bowling Green Road in support of Weirs’ Maryland Battery.
1863
January 20-24 “Mud March”
January-April Duty near White Oak Church and constructing corduroy road below Fredericksburg
April 27-May 6 Chancellorsville Campaign
April 29-May 2 Operations at Franklin’s Crossing
May 3
Battle of Maryes Heights, (Second Battle of Fredericksburg)
May 3-4
Salem Heights
May 4
Banks’ Ford

The regiment was on the left flank of the Union line, attacked by Early’s division in an hour and a half of severe fighting. Colonel Van Houten was mortally wounded and captured.

June 19 Mustered out at Trenton, N. J.