The photograph of two “Union soldiers … somewhere in a sundered America” (“Coming Up in American Heritage,” February) is of New York City’s 22d Regiment of the National Guard, and the photograph was taken while the regiment was stationed at Harpers Ferry, West Virginia, in 1862. While at Harpers Ferry the 22d was extensively photographed. But like most National Guard units during the Civil War, the 22d was on active duty for only short periods of time. In 1862 they served from May to September, and in 1863 from June to July. The 22d later served in the Spanish-American War and in both world wars.