I am rereading the Sharpe´s series and note the time gap between the Battle of Trafalgar and Prey (Copenhagen). You probably know that most of the British ships (the Pucelle?) and a number of prizes retired to be repaired in Gibraltar where a few sailors were buried. The Rock was being sieged and Sharpe could have been involved. Please also note that the spelling in Rifles is AFRANCESADO. Best wishes.
Tito Serra