This small 1865 American Unitarian Association assortment of rousing songs and Bible readings (arranged for unison or responsive reading, and with headings like “Those who turn from Holiness are condemned”) isn’t explicitly for Union soldiers, but songs like “Arise, New-England’s Sons!” and “The Massachusetts Line” weren’t likely to appeal to Johnny Reb.
Fascinating! I wish I read music and so could hum a bit those melodies I don’t just recognize from memory. I particularly liked the lyrics set to the Marseilles; hard not to remember that scene from Casablanca.