The Ninety-Ninth Regiment, also known as the 99th New York Volunteer Infantry Regiment, was a unit in the Union Army during the American Civil War. Formed in 1861, it participated in several key battles, including the Battle of Gettysburg and the Battle of the Wilderness. The regiment was known for its diverse composition, including many immigrants. The Ninety-Ninth Regiment was mustered out in 1865 after serving for four years. Throughout its service, the regiment faced significant challenges, including harsh conditions and heavy casualties. Its legacy is remembered as part of the broader efforts of the Union forces in the war.