I don't recall, off hand, of any reports of Dragoon use in combat in the CW, but I can't say there were none.
But I doubt many CW cavalrymen on either side used a Dragoon by choice; it would have been like replacing a modern soldier's M4 with a 1917 Enfield. Besides, there were nowhere near enough. I don't recall the exact figures, but I think total Dragoon production was only some 20,000 and there had been a high attrition rate.
Jim
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