I know William Tate, Eleazar Oswald and John Skey Eustace served the French Republic during the French Revolutionary wars, however I'm most interested in the Napoleonic wars; Third Coalition and forward. Service to any country would be of interest.
For an example I'm aware Britain impressed American sailors into the British Navy prior to the War of 1812, this including some hundreds born in the United States.
However I haven't been able to find any of these individuals or accounts of them. The closest I've gotten were British citizens impressed while onboard American vessels.
Between Two Republics American Military Volunteers in Revolutionary France