80th New York Volunteer Infantry Regiment The 80th New York Volunteer Infantry Regiment , the " Twentieth New York State Militia " , " Ulster Guard " , was an infantry regiment of the Union Army during the American Civil War . Service . On the return of the 20th New York State Militia Regiment from its three months ' service , Col . George W . Pratt reorganized it at Kingston , New York as a regiment of volunteers , and it was mustered in the service of the United States for three years between September 20 and October 20 , 1861 . December 7 , 1861 , it received its State numerical designation , and May 24 , 1863 , the three years ' men of the 35th New York Volunteer Infantry Regiment . November 6 , 1864 , a new company joined the regiment . The companies were recruited principally in Ulster County ; men from neighboring counties also joined the regiment . The regiment left the State October 26 , 1861 ; served in Wadsworth ' s Brigade from October , 1861 ; in Irvin McDowell ' s Division , Army of Potomac , from November , 1861 ; in 2d Brigade , McDowell ' s Division , Army of Potomac , from January , 1862 ; in Marsena R . Patrick ' s , 1st , Brigade , King ' s , 3d , Division , 1st Corps , Army of Potomac , from March , 1862 ; in 2d Brigade , same division , Department of the Rappahannock , from May , 1862 ; in 3d Brigade , 1st Division , 3d Corps , Army of Virginia , from June , 1862 ; in same brigade and division , 1st Corps , Army of Potomac , from September 12 , 1862 ; in Patrick ' s Provost Guard Brigade , Army of Potomac , from January 7 , 1863 ; in 1st Brigade , 3d Division , 1st Corps , Army of Potomac , from June , 1863 ; in Provost Guard Brigade , Army of Potomac , from July 16 , 1863 ; in the Independent Brigade , 9th Corps , Army of Potomac , from March , 1865 ; on provost duty at City Point , Virginia , from April 7 , 1865 ; at Richmond , Virginia , from April 22 , 1865 ; at Norfolk , Virginia , from November 27 , 1865 ; and it was honorably discharged and mustered out , under Col . Jacob B . Hardenbergh , January 29 , 1866 , at Portsmouth , Virginia . The regiment left for Washington , D . C . and performed picket duty along the Potomac in the vicinity of Upton ' s Hill , during the first winter . It fought in Gen . John Pope ' s Virginia campaign . At the second Bull Run the 80th lost 279 in killed , wounded and missing , and Col . Pratt died a few weeks later of the wounds received in that battle . It was active at South mountain and Antietam , encamped at Sharpsburg for one week and marched through Crampton ' s Gap , Leesburg , Warrenton and Stafford Court House to Fredericksburg , where it participated in the battle . Winter quarters were established soon after near Hall ' s Landing , Virginia and occupied until Jan . 7 , 1863 , when the 80th was assigned , to the provost guard brigade , with headquarters at Brooks ' Station and remained on duty at army headquarters until after the battle of Chancellorsville . In June , 1863 , the regiment was closely engaged at Gettysburg , where it lost 170 killed , wounded or missing out of 287 engaged . It suffered most severely in the repulse of George Pickett ' s charge on the last day . After the battle of Gettysburg , the 80th was again ordered to headquarters for provost guard duty and continued in this service until the end of the siege of Petersburg , when it shared in the final assault , April 2 , 1865 . From April 22 to November 27 , 1865 , it was stationed at Richmond and then ordered to Norfolk , where it remained until mustered out on January 29 , 1866 . The regiment early became known for its fine fighting qualities and sustained a reputation for courage and steadiness under fire throughput its long term of service , which lasted , including its militia service , from the spring of 1861 to Jan . , 1866 . The regiment is classed among the " three hundred fighting regiments . " Total strength and casualties . The total enrollment of the regiment was 2 , 103 , of whom 128 died of wounds and 156 from accident , imprisonment or disease . During its service the regiment lost by death , killed in action , 5 officers , 81 enlisted men ; of wounds received in action , 3 officers , 39 enlisted men ; of disease and other causes , 156 enlisted men ; total , 8 officers ' , 276 enlisted , men ; aggregate , 284 ; of whom 22 enlisted men died in the hands of the enemy ; by the explosion of ammunition at City Point , Va . , August 9 , 1864 , the regiment lost , by death , 6 enlisted men .