United States Regiments & Batteries > Maine

Originally the 18th Maine Infantry Regiment

The First Maine Heavy Artillery Regiment sustained the greatest loss in battle of all the regiments in the United States Army in the Civi War, losing 23 officers and 400 enlisted men killed and mortally wounded; 260 also died of disease, a total of 683.

The regiment is honored by a monument on the Petersburg battlefield, where it suffered the greatest single day’s loss in killed and mortally wounded of any regiment in the Civil War.

Organized at Bangor, Maine
August 21 Organized at Bangor as the 18th Maine Volunteer Infantry Regiment and mustered in under the command of Colonel Daniel Chaplin.
August 24 Left State for Washington, D.C. Assigned to the Military District of Washington, Defences North of the Potomac
August 26 Duty in the Defences of Washington, building and garrisoning batteries and forts. Eight Companies were at Fort Alexandria, Company E at Batteries Vermont and Mattox, Company K at Batteries Cameron and Parrott.
January 6 The regiment’s designation was changed to 1st Maine Heavy Artillery Regiment
February Attached to 2nd Brigade, Haskins’ Division, 22nd Corps, Defences North of the Potomac
January Company L organized
February Company M organized
May 15 Attached to 2nd Brigade, 4th Division, 2nd Corps, Army of the Potomac and Moved to Belle Plains, Va. as a part of Tyler’s Heavy Artillery Division.
May 18

Rapidan Campaign

May 24 Attached to 1st Brigade, 3rd Division, 2nd Corps
May 19

Harris’ Farm, Fredericksburg Road

The regiment lost 82 killed, 394 wounded, and 5 missing; total 481

May 20-23 On line of North Anna
May 23-26

North Anna

May 26-28 On line of the Pamunkey River
May 23-31


June 1-5

Cold Harbor

June 5-12 Barker’s Mills
June 16-19

Before Petersburg

June 18
Hare’s House, Assault on Petersburg

Sustained the greatest loss of any one regiment in any one action of the war: 635 killed and wounded out of 900 engaged.

From the wayside marker on the Petersburg battlefield:

The field became a burning, seething, crashing, hissing hell, in which human courage, flesh and bone were struggling with an impossibility.…
– Capt. Horace H. Shaw, 1st Maine Heavy Artillery

At 4:30 p.m. on June 18, 1864, this regiment of former garrison troops charged across this field toward the Confederate lines near Colquitt’s Salient. As they moved, their supports — veteran regiments who knew the folly of attacking entrenched positions — huddled under cover, leaving the 1st Maine to attack alone. Confederate musketry and artillery devastated the regiment.

For the next ten minutes, the 1st Maine Heavy Artillery lost the equivalent of a man each second: 632 men killed and wounded (out of almost 900 engaged), more than any other regiment in any other single battle of the war. The Confederates, behind earthworks, lost just 25.

June 16

Siege of Petersburg

June 22-23

Weldon Railroad

June 24 – July 23 Picket duty at Deserted House
July Attached to 2nd Brigade, 3rd Division, 2nd Corps
July 27-29 Demonstration on north side of James River
July 27-28

Deep Bottom

July 29 –
August 12
Duty at Hare’s House
August 13-20 Demonstration on north side of James River
August 14-18

Second Battle of Deep Bottom (Strawberry Plains)

Colonel Chaplin was mortally wounded by a sharpshooter and would die four days later in a Philadelphia hospital.

August 19 Near Fort Sedgwick
September 30 –
October 2

Poplar Springs Church

October 1 Yellow House
October 2 Squirrel Level Road
October 6-24 At Fort Sedgwick
October 27-28

Boydton Plank Road, Hatcher’s Run

December 7-12 Warren’s Hicksford Raid
February 5-7

Battle of Hatcher’s Run

March 25 Armstrong House
March 28-April 9

Appomattox Campaign

March 29 South Side Railroad
March 29-31 Boydton Road and White Oak Ridge
April 2

Fall of Petersburg

April 5 Jettersvtlle
April 6

Amelia Springs and Sailor’s Creek

April 7


April 9

Appomattox Court House

Surrender of Lee and his army.

May 9-16 Moved to Washington, D.C.
May 23 Grand Review
June Attached to 3rd Brigade, Hardin’s Division, 22nd Corps
June 27 Garrison Forts in the Defences of Washington from Fort Washington to Fort Mahone
September 11 The 1st Maine Heavy Artillery mustered out and was ordered to Bangor, Me.
September 20 Discharged