5th New Hampshire Volunteer Infantry The 5th New Hampshire Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War . The regiment has the unfortunate distinction of having sustained the greatest total loss in battles of any infantry or cavalry regiment in the Union Army , with a total of 295 killed and 756 wounded , for a total of 1 , 051 men . Service . The 5th New Hampshire Infantry was organized in Concord , New Hampshire and mustered in for a three year enlistment on October 22 , 1861 under the command of Colonel Edward Ephraim Cross . The regiment was attached to Howard ' s Brigade , Sumner ' s Division , Army of the Potomac , to March 1862 . 1st Brigade , 1st Division , II Corps , Army of the Potomac , to July 1863 . Concord , New Hampshire , Department of the East , to November 1863 . Marston ' s Command , Point Lookout , Maryland , to May 1864 . 1st Brigade , 1st Division , II Corps , Army of the Potomac , to June 1865 . The 5th New Hampshire Infantry mustered out of service June 28 , 1865 and was discharged July 8 , 1865 . Detailed service . Left New Hampshire for Washington , D . C . , October 29 , 1861 . Camp at Bladensburg , Md . , defenses of Washington , D . C . , until November 27 , 1861 . Expedition to lower Maryland November 3 – 11 . At Camp California , near Alexandria , Va . , until March 10 , 1862 . Scout to Burke ' s Station January 17 , 1862 ( Company A ) . Advance on Manassas , Va . , March 10 – 15 . Reconnaissance to Gainesville March 20 , and to Rappahannock Station March 28 – 29 . Warrenton Junction March 28 . Moved to the Virginia Peninsula April 4 . Siege of Yorktown , Va . , April 5 - May 4 . Temporarily attached to Woodbury ' s Engineer Brigade . Construct Grapevine Bridge over Chickahominy May 28 – 30 . Battle of Fair Oaks or Seven Pines May 31 - June 1 . Seven days before Richmond June 25 - July 1 . Orchard Station June 28 . Peach Orchard , Allen ' s Farm and Savage ' s Station June 29 . White Oak Swamp and Glendale June 30 . Malvern Hill July 1 . At Harrison ' s Landing until August 16 . Movement to Fortress Monroe , then to Alexandria and to Centreville , Va . , August 16 – 30 . Cover Pope ' s retreat from Bull Run . Maryland Campaign September – October . Battle of South Mountain , Md . , September 14 ( reserve ) . Antietam Creek , near Keedysville , September 15 . Battle of Antietam , September 16 – 17 . Duty at Harpers Ferry , W . Va . , September 21 to October 29 . Reconnaissance to Charlestown October 16 – 17 . Advance up Loudoun Valley and movement to Falmouth , Va . , October 29 - November 17 . Battle of Fredericksburg , Va . , December 12 – 15 . Burnside ' s Second Campaign , " Mud March , " January 20 – 24 , 1863 . Duty at Falmouth until April . Chancellorsville Campaign April 27 - May 6 . Battle of Chancellorsville May 1 – 5 . Reconnaissance to Rappahannock June 9 . Gettysburg Campaign June 13 - July 24 . Battle of Gettysburg , July 1 – 3 . Moved to Concord , N . H . , July 26 - August 3 . Duty at Draft Rendezvous , Concord , N . H . , until November . Moved to Point Lookout , Md . , November 8 – 13 , and duty there guarding prisoners until May 27 , 1864 . Moved to Cold Harbor , Va . , May 27 - June 1 , and joined the Army of the Potomac . Battles about Cold Harbor June 1 – 12 . Before Petersburg , Va . , June 16 – 19 . Siege of Petersburg June 16 , 1864 to April 2 , 1865 . Jerusalem Plank Road June 22 – 23 , 1865 . Deep Bottom , north of James River , July 27 – 28 . Mine Explosion , Petersburg , July 30 ( reserve ) . Demonstration north of James River August 13 – 20 . Strawberry Plains August 14 – 18 . Ream ' s Station August 25 . Non - veterans mustered out October 12 , 1864 . Reconnaissance to Hatcher ' s Run December 9 – 10 . Dabney ' s Mills , Hatcher ' s Run , February 5 – 7 , 1865 . Watkins ' House March 25 . Appomattox Campaign March 28 - April 9 . On line of Hatcher ' s and Gravelly Runs March 29 – 30 . Hatcher ' s Run or Boydton Road March 31 . White Oak Road March 31 . Sutherland Station April 2 . Fall of Petersburg April 2 . Sayler ' s Creek April 6 . High Bridge and Farmville April 7 . Appomattox Court House April 9 . Surrender of Lee and his army . Moved to Washington , D . C . , May 2 – 12 . Grand Review of the Armies May 23 . Casualties . The regiment lost a total of 473 men during service ; 18 officers and 277 enlisted men killed or mortally wounded , 2 officers and 176 enlisted men died of disease .