Organized at Bangor as 18th Infantry and mustered in August 21, 1862.
Left State for Washington, D. C., August 24.
Designation changed to 1st Heavy Artillery January 6, 1863.
Company L organized January, 1864, and Company M February, 1864.
Attached to Defenses of Washington August, 1862, to February, 1863.
2nd Brigade, Haskins' Division, 22nd Army Corps. Defenses North of the Potomac to May, 1864.
2nd Brigade, 4th Division, 2nd Army Corps, Army of the Potomac, to May 24, 1864.
1st Brigade, 3rd Division, 2nd Army Corps, to July, 1864.
2nd Brigade, 3rd Division, 2nd Army Corps, to June, 1865.
3rd Brigade, Hardin's Division, 22nd Corps, to September, 1865.
Duty in the Defenses of Washington, building and garrisoning Batteries and Forts.
Eight Companies at Fort Alexandria, Company E at Batteries Vermont and Mattox, Company K at Batteries Cameron and Parrott, August 26, 1862, to May 15, 1864.
Moved to Belle Plains, Va., May 15, 1864, as
gade, 1st Division, Army of the Frontier, to December, 1862.
Columbus, Ohio, to April, 1863.
Kautz's 1st Cavalry Brigade, District of Central Kentucky, Dept. Ohio, to June, 1863.
3rd Brigade, 1st Division, 23rd Army Corps, Army of the Ohio, to August, 1863.
3rd Brigade, 4th Division, 23rd Army Corps, to November, 1863.
1st Brigade, 2nd Division Cavalry, 23rd Army Corps, to February, 1864.
Columbus, Ohio, to April, 1864.
Cavalry, 9th Army Corps, Army of the Potomac, to May 24, 1864.
1st Brigade, 3rd Division, Cavalry Corps, Army of the Potomac, and Middle Military Division, to May, 1865.
Dept. of Missouri to October, 1865.
Expedition to Fort Scott, Kan., February 18-March 2, 1862.
Action at Independence, Mo., February 22.
Expedition to Diamond Grove, Kan., April 15-May 7.
Action at Horse Creek May 7.
Expedition into Indian Territory May 25-July 8.
Action at Grand River June 6.
Capture of Fort Gibson July 18.
Bayou Bernard Ju