We watched the first episode of Ken Burns's Civil war this evening. Hard to believe it first came out 25 years ago. I paid more attention to the music this time, especially to a tune that didn't get picked up on the soundtrack album or on any of the many websites devoted to the documentary. I finally placed the old tune, which is sometimes called "Kingsfold," often now played as arranged by Ralph Vaughan Williams and adapted to various hymn lyrics, a common one being "I Heard the Voice of Jesus Say":
The tune is also associated with Child Ballad #56, "Dives and Lazarus," as well as with "The Star of the County Down." Perhaps more to the point re the Civil War connection, it's also known as "The Fighting 69th," a/k/a the Irish Brigade.