CR: I just sent you a site to google. It seems the song is also called "Dick German the Cobbler". It is the story of John Hewson, a shoemaker who aided Cromwell in the Irish campaign of 1649-50. I think from that that it might be a reference to one of the camps he was in at some point. I'd post a link directly to the site but it's pdf of Google books and I don't understand how to link it.