Heard this wonderful story from Sara Grey a few years ago:
Apparently when Jean Ritchie was traveling in the UK on a scholarship in the 1950s to visit and listen to trad singers there -
She sang the Texas Rangers to Jane Turriff (or maybe it was Lucy Stewart) and Jane/Lucy was greatly impressed. However she misconstrued a couple of fairly vital things. She thought that the Indians mentioned were natives of India and that the Rangers, therefor, were an obscure branch of the British Army deployed in the North West Frontier. She learned the song then decided that it was missing something, so she added an extra verse on the end warning the Rangers to beware of the tigers. I believe that she recorded her version!
Ah - the folk process.