The short answer to your question is "yes, it is very possible that TN units served in the Niagara area". Take a look at the US map and think about a VA unit that marched from home to Detroit. They most likely got home the same way. To go south through the US., they were sometimes fortunate enough to find boats and streams flowing in the right direction that were "boatable", but I think going north you have to get very near to the Lakes and the St. Laurence River to benefit from north flowing waters. It was not just the actual movement from one place to another that posed problems. What to eat (whose cow?) and where to sleep (in whose pasture?) also were difficulties to overcome. To march from TN to Niagara would wear out how many pairs of boots that were made by hand by the shoemaker? When someone was injured or ill, they often left another soldier with him to get him to a place where he could be cared for and recover. The companion was told to leave as soon as possible and catch up. The patient had the same obligation. In trying to track my ancestor, I find many of the same problems you encountered....with where was the officer and lack of history of the precise units in which my guy served. Sometimes the units have been soundly researched by a group of re-enactors. Sometimes the govt seems to have great records and other times almost nothing. Some of the officers the family tradition cites for my ancestor, I cannot find even mentioned in the data that exists now. I guess we are fortunate to be able to find out much of anything about a time nearly 200 years ago when records were made with pen and quill and so easily destroyed by the elements and man. When the Brits burned Washington DC's government buildings to the ground, they did us no favor. Ron Gaddis, Lincoln, NE