Ugh. And again ugh. For a real Civil War folksong, find Frank Proffitt's rendition of "Old Abe is in the White House," which he learned from one of his grandfathers, I believe. Tnen compare it with both the PHC travesty and any of the "parlor" songs of the age.
An interesting exercise in diction, point of view, and the value of experience.

See also "The Battle of Shiloh's Hill," mentioned in another thread.

Will post lyrics to Proffitt's song when I can dig them out.