The 33rd Massachusetts Infantry Regiment lost 7 officers and 104 enlisted men killed or mortally wounded and 77 enlisted men to disease during the Civil War. It is honored by a monument at Gettysburg.

1862
August 6 Organized at Springfield under Colonel Alberto C. Maggi
August 14-17 Moved to Washington, D.C. and attached to Military District of Washington for duty in the Defenses of Washington, D. C. and Provost at Alexandria, Va.
September 19 Major Bates, former Captain in the 12th Massachusetts Infantry, returned to that regiment as colonel
October 10 Moved to Fairfax Station and then to Fairfax Court House. Attached to 2nd Brigade, 2nd Division, 11th Army Corps, Army of the Potomac
November 1-20 Moved to Warrenton, then to Germantown
December 10-15 March to Fredericksburg
December 15 Camp at Falmouth
1863
January 20 – 24 “Mud March”, then at Falmouth
April 27-May 6 Chancellorsville Campaign
May 1-5
Battle of Chancellorsville
June 9
Battle of Brandy Station

Commanded by Colonel Adin B. Underwood.

June 11-July 24 Gettysburg Campaign
July 1-4
Battle of Gettysburg

The regiment was commanded at Gettysburg by Colonel Adin B. Underwood. It brought 562 men to the field.

From the monument:

Detached from the Second Brigade, Second Division, Eleventh Corps on July 2nd, 1863. After supporting the batteries in action on Cemetery Hill, while in position in a line extending westward from near this spot, withstood and assisted in repulsing a charge of the enemy’s infantry in its front. In the battle eight killed, thirty six wounded.

August 3 –
September 24
At Bristoe Station
September 24-
October 3
Movement to Bridgeport, Ala. and attached to Army of the Cumberland
October 25-28 March along line of Nashville & Chattanooga Railroad to Lookout Valley, Tenn.
October 28-29 Battle of Wauhatchie, Tenn.
November 23-27 Chattanooga-Ringgold Campaign
November 24-25 Tunnel Hill
November 25 Mission Ridge
November 28-
December 17
March to relief of Knoxville and duty in Lookout Valley
1864
April 3rd Brigade, 3rd Division, 20th Army Corps, Army of the Cumberland
May to September Atlanta Campaign
May 5-11 Demonstration on Rocky Faced Ridge
May 8-9 Buzzard’s Roost Gap
May 14-15 Battle of Resaca
May 19 Cassville
May 22-25 Advance on Dallas
May 25 Battle of New Hope Church
May 25-June 5 Operations on line of Pumpkin Vine Creek and battles about Dallas, New Hope Church and Allatoona Hills
June 10-July 2 Operations about Marietta and against Kenesaw Mountain
June 11-14 Pine Hill
June 15-17 Lost Mountain
June 15 Gilgal or Golgotha Church
June 17 Muddy Creek
June 19 Noyes Creek
June 22 Kolb’s Farm
June 27 Assault on Kenesaw
July 4 Ruff’s Station or Smyrna Camp Ground
July 5-17 Chattahoochie River
July 17 – August 27 Duty as Division Train Guard
July 19-20 Battle of Peachtree Creek
July 22-August 25 Siege of Atlanta
August 26-
September 2
Operations at Chattahoochie River Bridge
September 2-
November 15
Occupation of Atlanta
November 15-
December 10
March to the sea
December 10-21 Siege of Savannah
1865
January to April Campaign of the Carolinas
February 2 Lawtonville, S. C,
March 14 Skirmish, Raleigh Road, near Fayetteville, N. C.
March 16 Averysboro
March 19-21 Battle of Bentonville
March 24 Occupation of Goldsboro
April 10-13 Advance on Raleigh
April 14 Occupation of Raleigh
April 26 Bennett’s House, surrender of Johnston and his army.
April 29-May 20 March to Washington, D.C., via Richmond, Va.
May 24 Grand Review, then duty at Washington
June 11 Mustered out
July 2 Discharged from service