The 4th New York was a regiment in the Union Army during the American Civil War. Formed in 1861, it was composed mainly of volunteers from New York City and surrounding areas. The regiment played a significant role in several key battles, including the Battle of Gettysburg and the Battle of Antietam. Throughout its service, the 4th New York was known for its bravery and discipline. The regiment was part of the Army of the Potomac and contributed to various campaigns in the Eastern Theater. It was mustered out in 1863 after sustaining heavy casualties, leaving a lasting legacy in American military history.