The Cumberland Three - Songs Of The Civil War torrent

This album was published in 1991, though the songs within were originally released in 1960 as two separate albums:
Civil War Almanac – Vol. 1 (The Yankees), Roulette #25132
Civil War Almanac – Vol. 2 (The Rebels), Roulette #25133

Allmusic Link: http://www.allmusic.com/album/songs-of-the-civil-war-mw0000262424