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Santisima Trinidad captured
P.O.D.
For some reason, the Royal Navy saves or obtains a few more ships of the line in 1795 to 1797. At least 2 large ships should be available to capture the Spanish ship permanently after its initial surrender attempt and fight off the Spanish attempt to recapture the Spanish ship at Cape St. Vincent.

What happens in the aftermath: [Modified http://www.pbenyon.plus.com/18-1900/S/04085.html if simplified.]
After refitting in 1798, butterflies resulted in all French ships prevented from escaping the Nile as 2 or more British ships of the line ended up being involved and the Royal Navy would be able to prevent the ship's capture. The ship's manoeuvres resulted in its usage as convoy escort and colonial operations to free up other ships for blockading Europe. Trafalgar goes more or less as in reality [the ship mentioned was a liability but freed up British ships against the French and Spanish].
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