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Apparantly quite a few senior Confederate Generals were offered spots in foreign armies after 1865. Bureaugard was offered to head the armies of Romania and Egypt. Alexander Porter (artillery chief) thought about the Brazilian army. There are several more I can't remember off the top of my head.
What if the federal government takes a harsher stance against the ex-officers and more of them go abroad to serve different countries? Could some of them not only end up being in "second-rate" armies but end up in a first-rate armed forces of a great power like Prussia or France?