The 188th New York Infantry Regiment was an American Civil War infantry regiment from New York that served from October 1864 through July 1865 in the Union Army. Colonel James R. Chamberlain, succeeded by Col. John McMahon, received authority, September 14, 1864, to recruit this regiment, with headquarters at Rochester, where it was organized and mustered in the service of the United States for one year, October 4, 5, 7, 10 and 22, 1864; except Company A, originally Company C, 183d Infantry, which was mustered in at Elmira September 24, 1864. Formation The regiment was formed in upstate New York, drawing men from Monroe, Ontario, Livingston, Yates, and Steuben counties for one year of service. Company A of the 188th New York was mustered in at Elmira, Chemung County, New York, on September 24, 1864. Company A was originally Company C of the 183rd New York Infantry. Companies B through J were mustered into federal service on October 4, 1864, at Rochester, Monroe County, New York. Company K did not join the regiment until November. The companies were recruited principally: A at Villenova, Allegany, Madison, Yorkshire, Freedom and Mansfield; B at Rochester, Avon, Phelps, Victor, Italy, Penn Yan, Naples and Geneseo; C at Italy, Jerusalem, Rochester, Milo, Avon, Middlesex and Springtwater; D at Springwater, York, Sparta, Avon, Potter, Portage, North Dansville, Geneseo, Leicester and Mt. Morris; E at Livonia, Potter, Portage, Richmond, Avon, Farmington, Jerusalem, Springwater, Seneca, York and Leicester; F at Rochester, Corning, Canandaigua, Hornby and Tuscarora; G at Springwater, Avon, Gorham, Mt. Morris, Canandaigua, Sparta, Middlesex, Leicester, Italy and Barrington; H at Rochester, Sparta, Avon, Dansville and Springwater; I at Avon, Nunda, Rochester, Dansville, Livonia, Groveland, Conesus, Mt. Morris, Phelps and York; and K at Rochester, North Dansville, Conesus, Groveland, Torry, Milo, Avon and Middlesex. Federal service The 188th New York left the state to join the Army of the Potomac on October 13, 1864. Initially, only seven companies left the state but company K followed in November. The army was before Petersburg, Virginia, at that time. The regiment was placed in 2nd Brigade, 1st Division, V Corps then under Major General Gouverneur Warren. The 188th New York remained in this assignment for its entire federal service. On October 27, less than a month after first muster, the regiment went into battle at Hatcher's Run near the Weldon Railroad. The regiment suffered 7 dead and between 39 and