In Livingston, Tennessee an antique dealer sold me these four Civil War bullets. He told me that he had bought them from a 90 year old collector who had dug these with a metal detector near Nashville before the property was commercially developed in the 1970s.
The 90 year old told him that these were most likely part of the Battle of Nashville which was fought on December 15–16, 1864. Union (Federal) troops defeated the Confederate Army of Tennessee and marked the end of major Confederate offensives in the Western theater during the Civil War. For now these bullets will reside in Iowa's 42N territory.