Not exactly the military, but one of my ancestors, Antoine Brosseau (married 1821 to Louise Moreau)was involved (not too gloriously) in the Rebellion of 1837-1838. See "Essai de Monographie Paroissiale - St Georges d'Henryville et La Seigneurie de Noyan" by Fr. J.D. Brosseau, O.P., 1913 pages 128 -145.
Later Antoine Brosseau and his family relocated from Henryville, Quebec to Bourbonnais, Kankakee County, Illinois. One of his sons, namely Joseph Emmanuel (Noel) Brosseau fought in the Civil War. Noel was in Company D, 76th Regiment, Illinois Voluntary Infantry, He enrolled on 17 July 1862 Kankakee, Illinois. The regiment was mustered into the Union Army on 22 August 1862. Noel received an honorabl discharge on 22 July 1865 in Galveston, Texas. He enrolled as a 2nd Lieutenant. Became a 1st Lieutenant on 1 February 1864. He was discharged as a 1st Lieutenant. (See History of Kankakee for further background on the 76th Illinois Regiment.)