Can't say I've heard of it. Who's the author?
Well I obviously can't vouch for the Sharpe series (yet), but I can at least tell you that his Saxon Stories novels are reasonably accurate. He's obviously embellished certain events and/or filled in the blanks with his own imagination where details of said events are lacking (such as Alfred's decisive victory over Guthrum at the Battle of Edington), but there's nothing seriously out of joint.
About the greatest liberty I've seen him take was in The Last Kingdom (the first book in the series), in which he moved the Battle of Cannington up by one year. To his credit, he immediately copped to doing so in his historical notes at the end the novel, along with explaining his reasons why -- in fact, he's made an effort in every one of the first four books to explain any historical discrepancies/inaccuracies that appear, even minor onces. Overall, I'd say he's gone to a fair degree of effort to keep as much historical fidelity in his books as possible.
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