Thank you MaxD and thank you ShaunJ. It seems like Lionel would have had a small window of opportunity to romance the lady in question and get her with child! But the fact the lady named her wee baby girl after him, going so far as to give her a man's name (or at least a very unusual name for a Caithness child!) suggests she was very fond of this soldier! She married a few years later, but the wee girl seemed to lodge with her mother's relations, and then went in to service.
I don't see any other candidates for the the father. There was a Lionel Curtis born about 1820 but he didnt seem to have ever enlisted.
