Was HEIC Diana the first paddle steamer to see combat?
Short answerShe has a technically defensible 1824 claim, although earlier paddle craft may also have been used in conflict.
NotesA viewer raises HEIC Diana as the first paddle steamer to serve in combat, dating the claim to 1824. Diana's designation is technically defensible. Earlier paddle vessels may nevertheless have seen wartime use before the surviving record recognized the same milestone. The answer therefore treats Diana as a qualified first rather than an uncontested beginning of military paddle propulsion.