The 9th Massachusetts Volunteer Infantry Regiment lost 15 officers and 194 enlisted men killed or mortally wounded and 3 officers and 66 enlisted men to disease during the Civil War. It is honored by a monument at Gettysburg.

See a photograph of the 9th Massachusetts before celebrating Mass at Camp Cass near Washington, D.C.

1861
June 11 Organized at Boston under Colonel Thomas Cass. Recruited from men from Boston, Salem, Milford, Marlboro and Stoughton, with most of its volunteers of Irish birth or heritage.
June 27 Left State for Washington, D.C.;
June 30 Arrived in Washington and attached to the Department of Washington. Duty at Arlington Heights and Munson’s Hill.
July-August Constructed Fort Cass. Attached to Sherman’s Brigade, Division of the Potomac.
September Assigned to Morrell’s Brigade, Porter’s Division, Army of the Potomac
1862
March Assigned to 2nd Brigade, 1st Division, 3rd Army Corps, Army of the Potomac
March 16 Moved to the Peninsula, Virginia
April 4 Skirmish at Howard’s Bridge
April 5 Warwick Road
April 5-May 4 Siege of Yorktown
May Assigned to 2nd Brigade, 1st Division, 5th Army Corps, Army of the Potomac
May 27 Battle of Hanover C. H.
May 27-29 Operations about Hanover C. H.
June 25-July 1 Seven days before Richmond
June 26 Battle of Mechanicsville
June 27
Gaines’ Mill

The regiment lost 57 killed, 149 wounded and 25 missing defending a vital bridge and acting as rearguard

June 30 White Oak Swamp and Turkey Bridge
July l
Malvern Hill

The regiment lost 166 casuaties, including Colonel Cass, who was mortally wounded, and Acting Lt. Colonel Hawley, who was wounded. Acting Major O’Leary took over the regiment, as Lt. Colonel Guiney and Major Hanley were on sick leave.

July 2 – August 16 Duty at Harrison’s Landing. Lt. Colonel Guiney promoted to colonel.
August 10-28 Movement to Fortress Monroe, then to Centreville
August 28- September 2 Pope’s Campaign
August 29 Battle of Groveton
August 30
Second Battle of Bull Run
September 16-17
Battle of Antietam

The regiment was commanded by Colonel Patrick R. Guiney. It was in reserve and suffered no casualties,

September 19 Blackford’s Ford

 

September 20
Shepherdstown, Virginia

 

October 16-17 Reconnoissance toward Smithville, W. Va.
December 12-15
Battle of Fredericksburg
December 29-30 Expedition to Richard’s and Ellis’ Fords
1863
January 20-24 “Mud March”
April 27-May 6 Chancellorsville Campaign
May 1-5
Battle of Chancellorsville
June 11-July 24 Gettysburg Campaign
July 1-3
Battle of Gettysburg

The regiment was commanded by Colonel Patrick R. Guiney. It brought 474 men to the field.

Form the monument: 

Erected by the Ninth Regiment Infantry Massachusetts Volunteers, 2nd Brigade, 1st Division, 5th Army Corps, Army of the Potomac. During the Battle of Gettysburg the Ninth Regt. was detached from the 2nd Brigade and it held this position on Round Top. Casualties 26 men.

October 9-22 Bristoe Campaign
November 7 Rappahannock Station
November 26- December 2 Mine Run Campaign
December 3 At Bealeton and guard Orange & Alexandria Railroad
1864
January 14, Bealeton (1 Company)
May-June Rapidan Campaign
May 5-7
Battle of the Wilderness

Colonel Guiney was badly wounded while commanding the brigade. The regiment, under the command of Lt. Colonel Hanley, lost 26 killed, 108 wounded and 3 missing.

May 8 Battle of Laurel Hill
May 8-21
Battle of Spottsylvania Court House

The regment lost 25 killed, 71 wounded and 9 missing.

May 12 Assault on the Salient at Spottsylvania C. H.
May 23-26 North Anna River
May 24 Jericho Mills
May 26-28 Line of the Pamunkey
May 28-31 Totopotomoy
June 1-10 Cold Harbor
June 10 Left front and ordered home for muster out.
June 21 Mustered out