New York 21st Infantry, Company I (Union)
08 May 1861
New York 21st Infantry, Company I organized at New York.
17 Sep 1862
Participated in the Battle of Antietam at Sharpsburg, Maryland.
The Army of the Potomac, under the command of Maj. Gen. George McClellan, mounted a series of powerful assaults against General Robert E. Lee's forces along Antietam Creek near Sharpsburg, Maryland, on September 17th, 1862.
18 May 1863
New York 21st Infantry, Company I mustered out at New York.