The Roud number for "The Sergeant in the Wagon Train" is 1354. Searching on that at the EFDSS site turns up quite a few other versions of that song, most titled "William of the Wagon Train". I haven't checked other sources, and I'm surprised this song has heretofore passed under the Mudcat radar. I quite like the tune Mary found.

Kudos to Mary for her rendition, and for the lead.