Natchez National Cemetery Postcard, Courtesy of the Mississippi Department of Archives and History. "Natchez National Cemetery dates to 1866, one of 21 national cemeteries established in that year. Located on a bluff overlooking the Mississippi River, the site’s topography influenced its unique layout of irregular shaped burial sections, terraced hillsides, and gravel and grass pathways."
"Corinth National Cemetery (Mississippi) was established in 1866 as a place to inter the Union casualties of the Second Battle of Corinth, and other battles in the region. By the late 1870s there were over 5,000 interments in the cemetery...nearly 4,000 of which were unknown. [It] was added to the National Register of Historic Places in 1996. Along with other sites, it was included in Siege and Battle of Corinth Sites, a National Historic Landmark designated in 1991." (Wikipedia)
Just visited the National Cemetery at Vicksburg, Mississippi. Graves of over 17,000 Union soldiers (Confederate soldiers couldn't be buried in National Cemeteries) and over 13,000 are unknown. These are the graves with the small, square markers with just a number.