I would recommend reading EL Doctorow's recent novel "The March" to get a flavour of the politics which fed that era or a biography of Tecumseh Sherman.
The film seems understated when you read those.
Hi Kiwi - I have confused "The Patriot" with another film which I have seen. The Patriot pre-dates the era I have referred to in my earlier reply.
Regarding your specific query the book I would best recommend is "A Few Bloody Noses" by Robert Harvey, a writer for the Daily Telegraph and The Economist. The book was published 2001 by John Murray, London and should be easy to locate through library system.
Isn't that the one where the British lock up a load of colonists in a church and set it alight? I believe that was based on something similar the German army did in WWI. Not 100% about details but based on that, and a lot US cinematic accounts of historical fact, its only a film and should be treated as entertainment rather than fact.
To the most recent correspondent: You're pushing your luck re: Mel Gibson!
When it comes to inaccuracy in portraying political events across the world nobody but nobody does it better than the English in modern times. Anyway, 1.5% would still be higher than your venerable Lord Chief Justice Widgery managed in his 1972 work of complete fiction based on an historical event which happened only eight weeks earlier.