While looking to see if Digger's Carols were grave digger's carols (they weren't), I realized I never had gone looking for information on "The World Turned Upside Down" a.k.a. "The Digger's Song".

There's some interesting information on the Diggers at http://www.lglobal.com/TAO/Freedom/winst.html

BTW, I find the song is best when you sing it, as I believe Dick Gaughn sings it: by changing only a couple of lines, it can be sung from the point of view of one of the soldiers who helped "cut them down" and ever afterwards wonders about the morality of his act.