, 17 ( 1812 )
You have not received an answer for such a period of time because you have given little information. It is necessary to write more, and the last name of the person. In the names of the military formation, the words "Belarusian-Lithuanian" do not seem to occur until 1919. I can assume that this may be (as one of the options) the 17th LITHUANIAN regiment of Ulans. It was formed in the area of Vilna and Braslav from local residents (the current territories of Lithuania and Belarus) and fought on the side of Napoleon. Some surnames are known to me, so ask correctly with all the available information! Good luck! ---
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