With the Sharpe books, the actual battles and relevant dates are usually correct. There are obviously fictional characters and embellishments. Also Sharpe takes the glory of a number of real people that aren't mentioned. Having said that it is fiction.
The Grail Quest books also seem to be fairly accurate (but how many ordinary people have heard of the Siege of La Roche-Derriene (I think the spellings is right)). Having said that the last book is entirely fictional.
IMO however, Cornwell keeps an accurate historical context, and explains reasoning if there are any major departures from reality.
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