9th New Hampshire Volunteer Infantry The 9th New Hampshire Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War . Service . The 9th New Hampshire Infantry was organized in Concord , New Hampshire and mustered in for a three year enlistment on August 15 , 1862 . The regiment was attached to 1st Brigade , 2nd Division , IX Corps , Army of the Potomac , to March 1863 . 1st Brigade , 2nd Division , IX Corps , Department of the Ohio , to June 1863 . 1st Brigade , 2nd Division , IX Corps , Army of the Tennessee , to September , 1863 . District of North Central Kentucky , 1st Division , XXIII Corps , Department of the Ohio , to February 1864 . 1st Brigade , 2nd Division , IX Corps , Army of the Ohio , to April 1864 . 2nd Brigade , 2nd Division , IX Corps , Army of the Potomac , to June 1865 . The 9th New Hampshire Infantry mustered out of service June 10 , 1865 . Recruits whose enlistments had not expired were transferred to the 6th New Hampshire Infantry . Detailed service . Left New Hampshire for Washington , D . C . , August 25 , 1862 . At Arlington Heights , Va . , until September 6 . March to Monocacy River to join army September 6 – 13 . Battle of South Mountain , Md . , September 14 , 1862 . Battle of Antietam , September 16 – 17 . Duty in Pleasant Valley , Md . , until October 27 , 1862 . Movement to Falmouth , Va . , October 27 - November 19 . Waterloo Bridge November 9 – 10 . Battle of Fredericksburg , December 12 – 15 . Burnside ' s Second Campaign , " Mud March , " January 20 – 24 , 1863 . Moved to Newport News , Va . , February 11 ; then to Lexington , Ky . , March 25 – 31 . Duty in central Kentucky until June . Moved to Vicksburg , Miss . , June 3 – 14 . Siege of Vicksburg , Miss . , June 14 - July 4 . Advance on Jackson , Miss . , July 4 – 10 . Siege of Jackson , Miss . , July 10 – 17 . At Milldale , Miss . , until August 10 . Moved to Covington , Ky . , August 10 – 21 ; then to Camp Nelson , Ky . , August 25 . Duty guarding railroad between Cincinnati , Ohio , and Camp Nelson , Ky . , until January 1864 . Moved to Camp Burnside January 15 , 1864 . March to Knoxville , Tenn . , February 19 - March 17 . March across Cumberland Mountains to Camp Burnside and Nicholasville , Ky . , March 21 – 31 . Moved to Annapolis , Md . , April 2 – 5 . Campaign from the Rapidan to the James River , Va . , May 3 - June 15 . Battles of the Wilderness May 5 – 7 ; Spotsylvania May 8 – 12 ; Spotsylvania Court House May 12 – 21 . Assault on the Salient at Spotsylvania Court House May 12 . North Anna River May 23 – 26 . On line of the Pamunkey May 26 – 28 . Totopotomoy May 28 – 31 . Cold Harbor June 1 – 12 . Bethesda Church June 1 – 3 . Before Petersburg June 16 – 19 . Siege of Petersburg June 16 , 1864 to April 2 , 1865 . Mine Explosion , Petersburg , July 30 , 1864 . Weldon Railroad August 18 – 21 . Poplar Springs Church September 29 - October 2 . Boydton Plank Road , October 27 – 28 . Garrison , Fort Alexander Hays , until April 1865 . Appomattox Campaign March 28 - April 9 , 1865 . Assault on and fall of Petersburg April 2 . Occupation of Petersburg April 3 . Pursuit of Lee April 3 – 6 . Detached to guard Ewell ' s Army April 6 . Moved to Alexandria April 20 – 27 and duty there until June . Grand Review of the Armies May 23 . Casualties . The regiment lost a total of 409 men during service ; 10 officers and 145 enlisted men killed or mortally wounded , 3 officers and 251 enlisted men died of disease .