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Third regiment Massachusetts Heavy Artillery.
（1)
Col. William S. Abert,
Bvt. Brig. Gen. U. S. Vols.
| | | companies. |
| Field and staff. | Line. | A | B | C | D | E | F | G | H | I | K | L | M | Unassigned Recruits. | Totals. |
| Number on regimental rolls,— |
| Officers, | 8 | 86 | – | – | – | – | – | – | – | – | – | – | – | – | – | 94 |
| Enlisted men,1 | 9 | – | 186 | 155 | 141 | 149 | 139 | 157 | 152 | 161 | 144 | 162 | 134 | 148 | 7 | 1,844 |
| Totals, | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 1,938 |
| Enlisted men (included above) commissioned in regiment.2 | 2 | – | 3 | 4 | 3 | 6 | 2 | 4 | 3 | 3 | 1 | 3 | 2 | 1 | – | 37 |
| Enlisted men (included above) serving elsewhere within regiment. | – | – | – | – | 2 | – | 1 | – | 1 | – | – | – | – | – | – | 4 |
| Totals, | 2 | – | 3 | 4 | 5 | 6 | 3 | 4 | 4 | 3 | 1 | 3 | 2 | 1 | – | 41 |
| Actual total of members of regiment,— |
| Officers, | 8 | 86 | – | – | – | – | – | – | – | – | – | – | – | – | – | 94 |
| Enlisted men,3 | 7 | – | 183 | 151 | 136 | 143 | 136 | 153 | 148 | 158 | 143 | 159 | 132 | 147 | 7 | 1,803 |
| Totals, | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 1,897 |
The 3d Mass. Heavy Artillery was organized in the autumn of 1864, and was composed of the 3d and 6th to 16th Unattached Cos. of Heavy Artillery.
Of these, the 3d and 6th to the 13th Cos. were mustered into service in 1863: the 3d on Jan. 10, 1863, the 6th May 19, and the remainder were mustered on dates varying from August to November, having served since their muster in the forts on the
Massachusetts coast.
On the organization of the companies into the 3d Heavy Artillery, the 13th (mustered in January, 1864), the 14th and 15th (in May), the 16th (in August), were added, and the regiment (with the exception of Co. I, which was on detached service) engaged in the defences of
Washington, being stationed at the forts in the vicinity of the city during its entire service.
Co. I, recruited mainly from
Springfield, Mass., never actually joined the regiment.
Having been mustered Feb. 10, 1864, it sailed for
Fortress Monroe March 7, and was assigned to engineer duty under
Capt. F. U. Farquhar,
chief engineer, Depart.
ment of
Virginia; it was placed in charge of the pontoon trains of the Army of the James, and was engaged throughout its term of service in all branches of engineer work, building bridges, roads and wharves, having charge of the pontoon bridge thrown across the
James River during the siege of
Petersburg and the bridges at
Farmville, by which the 2d and 6th Corps crossed in pursuit of the
Confederates.
A portion of the main regiment was mustered out June 17, 1865, the remainder serving until September 18. Co. I was mustered out September 26.
