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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. |
| | | | A | B | C | D | E | F | G | H | I | K |
| Number on regimental rolls,— |
| Officers, | 17 | 59 | – | – | – | – | – | – | – | – | – | – | – | – | 76 |
| Enlisted men,1 | 19 | – | 23 | 172 | 166 | 168 | 163 | 157 | 149 | 164 | 156 | 159 | 150 | 5 | 1,651 |
| Totals, | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 1,727 |
| 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 |
| Totals, | 13 | – | – | 2 | 3 | 4 | 5 | 4 | 4 | 3 | 3 | 3 | 1 | – | 45 |
| Actual total of members of regiment,— |
| Officers, | 17 | 59 | – | – | – | – | – | – | – | – | – | – | – | – | 76 |
| Enlisted men,3 | 6 | – | 23 | 170 | 163 | 164 | 158 | 153 | 145 | 161 | 153 | 156 | 149 | 5 | 1,606 |
| Totals, | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 1,682 |
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 for
Washington June 25.
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 and
Cumberland, to
White House, Va., and on May 25 encamped at
Gaines's Mill, taking part in the
battle of Hanover Court House,
Va., 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 in November.
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,
Spotsylvania 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.
Reaching
Massachusetts on the 15th, it was mustered out at
Boston, June 21, 1864.
