Ninth regiment Massachusetts Infantry.
（1) Col. Thomas Cass
（2) Col. Patrick R. Guiney
, Bvt. Brig. Gen.
U. S. Vols.
（3) Col. Cromwell G. Rowell
|Field and Staff.||Line.||Band.||companies.||Unassigned Recruits.||Totals.|
|Number on regimental rolls,—|
|Enlisted men (included above) commissioned in regiment.2||13||–||–||2||3||4||4||4||4||2||3||3||1||–||43|
|Enlisted men (included above) serving elsewhere within regiment.||–||–||–||–||–||–||1||–||–||1||–||–||–||–||2|
|Actual total of members of regiment,—|
The 9th Mass. Infantry was recruited in April, 1861, by Col. Thomas Cass
who early in the month requested the Governor
for permission to form an Irish regiment for three years service, thus making it the first Irish regiment formed in Massachusetts
; in consideration of which it carried an Irish flag as well as the national and State colors.
Its members were recruited from all parts of the State
; and encamping at Long Island
, Boston Harbor
, through May and part of June, it was mustered into service June 11, 1861, and left the State
The regiment encamped at Arlington Heights
until October, moving then to Miner's Hill
, Va., where it remained during the winter of 1861-62.
On March 21, 1862, it embarked for Fortress Monroe
to engage in the Peninsular Campaign
, and took active part in the siege of Yorktown
After the evacuation of the city the regiment moved, by the way of West Point
, to White House, Va.
, and on May 25 encamped at Gaines's Mill
, taking part in the battle of Hanover Court House
, May 27.
Returning, it remained in camp afterward until June 26 when it took part in the battle of Mechanicsville
; returning on the next day to Gaines's Mill
to meet, in the engagement there, on June 27, the greatest loss suffered during its service; it took part, with loss also, at Malvern Hill
July 1, where Colonel Cass
was mortally wounded.
Returning from the Peninsula
, the regiment was engaged August 29, without loss, at Manassas
, and moving with the army to Washington
, began its march into Maryland
September 12, being present, in reserve, at the battle of Antietam
September 17, and engaged at Fredericksburg
Dec. 13, 1862.
After spending the winter of 1863 at Falmouth, Va.
, the regiment was engaged at Chancellorsville
(May 3) and Gettysburg
, having met the enemy also in the latter part of May while on picket duty on the Rappahannock
Taking part in the pursuit of the enemy after the battle of Gettysburg
, it was engaged at Wapping Heights July 24, 1863.
The regiment encamped afterward at Beverly Ford on the Rappahannock
and remained doing picket duty until September 14, engaging then in the actions at Rappahannock Station and taking part in the Mine Run campaign
It occupied winter quarters at Bealton Station until April 30, 1364, when it moved toward the Wilderness
, and going into action May 5, took part in the following days' battles, moving with the army and engaging at Laurel Hill
and Cold Harbor.
On June 10, 1864, its term of service expired and the day found the regiment at Bottom's Bridge, Va., under heavy fire; it withdrew to White House Landing
and on June 12 arrived at Washington
on the 15th, it was mustered out at Boston
, June 21, 1864.