The 9th New Hampshire Volunteer Infantry Regiment lost 10 officers and 145 enlisted men killed or mortally wounded and 3 officers and 251 enlisted men to disease during the Civil War.

1862
Organized at Concord
August 15 Mustered in under the command of Colonel Enoch Q. Fellows, who had attended West Point in the Class of 1848 but resigned before graduating.
August 25 Left State for Washington, D.C.
August 26 At Arlington Heights, Va.
September 6-13 March to Monocacy River to join army. Attached to 1st Brigade, 2nd Division, 9th Army Corps, Army of the Potomac
September 14
Battle of South Mountain
September 16-17
Battle of Antietam

From the War Department marker at Burnside’s Bridge on the Antietam battlefield:

At daylight of the 17th Nagle’s Brigade was about a half mile northeast of this point. It moved to the south and, at 10 A.M., was formed for assault on the bridge. The 2nd Maryland took position in the old lane 110 yards southeast of this point, and the remainder of the Brigade under cover of the hill and in rear of the 2nd Maryland. At 11 A.M. the 2nd Maryland, closely followed by the 6th New Hampshire, both moving by the flank, charged down the hill under a heavy fire of artillery and musketry. They passed through the opening in the fence at this point and reached within 250 feet of the bridge, when their advance was checked. Many of the men took shelter behind the fences and trees bordering the stream, and supported Ferrero’s Brigade in its successful assault. The Brigade then crossed the bridge, filed to the left, and occupied the high ground beyond. Late in the day it moved forward and co-operated in checking the advance of the right of A.P. Hill’s Division.

From the War Department marker along Branch Avenue on the Antietam battlefield:

The Brigade assisted in carrying the Burnside Bridge, and crossed it soon after 1 P.M. After the repulse of the three Divisions of Willcox, Scammon and Rodman later in the day Ferrero’s and Nagle’s Brigades advanced to the crest of the ridge about 420 yards east of this to check Confederate pursuit. The 48th Pennsylvania supported and relieved the 51st Pennsylvania, engaging the Confederates posted on this line and behind the stone walls right and left of this point. The engagement continued into the night, and the Regiment and Brigade bivouacked on the ground on which they had fought.

September-October Duty in Pleasant Valley, Md.
October 27-
November 19
Movement to Falmouth, Va.
November 9-10 Waterloo Bridge
November 12 Colonel Fellows resigned due to poor health. Herbert B. Titus was promoted to colonel.
December 12-15
Battle of Fredericksburg
1863
January 20-24 Burnside’s Second Campaign, “Mud March”
February 11 Moved to Newport News, Va.
March 25-31 To Lexington, Ky. and duty in the Blue Grass Region of Kentucky. Attached to 1st Brigade, 2nd Division, 9th Army Corps, Dept. of the Ohio
June 3-14 Moved to Vicksburg, Miss. and attached to 1st Brigade, 2nd Division, 9th Army Corps, Army of the Tennessee
June 14-July 4 Siege of Vicksburg, Miss.
July 4-10 Advance on Jackson, Miss.
July 10-17 Siege of Jackson, Miss.
July At Milldale, Miss.
August 10-21 Moved to Covington, Ky.
August 25 To Camp Nelson, Ky.
September-December Duty guarding railroad between Cincinnati, Ohio, and Camp Nelson, Ky. Attached to District of North Central Kentucky, 1st Division, 23rd Army Corps, Dept. of the Ohio
1864
January 15 Moved to Camp Burnside
February 19-March 17 March to Knoxville, Tenn. attached to 1st Brigade, 2nd Division, 9th Army Corps, Army of Ohio
March 21-31 March across Cumberland Mountains to Camp Burnside and Nicholasville, Ky.
April 2-5 Moved to Annapolis, Md. and attached to 2nd Brigade, 2nd Division, 9th Army Corps, Army of the Potomac
May 3-June 15 Campaign from the Rapidan to the James River, Va.,
May 5-7
Battle of the Wilderness
May 8-21
Battle of Spotsylvania Court House
May 12 Assault on the Salient at Spotsylvania Court House
May 23-26 North Anna River
May 26-28 On line of the Pamunkey
May 28-31 Totopotomoy
June 1-12
Cold Harbor
June 1-3 Bethesda Church
June 16-19
First Assault on Petersburg
June 16 Siege of Petersburg begins
July 30 Mine Explosion, Petersburg
August 18-21 Weldon Railroad
September 29-
October 2
Poplar Springs Church
October 27-28 Boydton Plank Road, Hatcher’s Run
November Garrison, Fort Alexander Hays
1865
March 28-April 9 Appomattox Campaign
April 2
Assault on and fall of Petersburg
April 3 Occupation of Petersburg
April 3-6 Pursuit of Lee
April 6 Detached to guard Ewell’s Army
April 20-27 Moved to Alexandria
May 23 Grand Review
June 10 Mustered out. Recruits transferred to 6th New Hampshire Infantry.