For those interested (probably only me), Turn: Washington's Spies has just started Series 4.
The kid who played Billy Elliott is now grown up and playing a farmer on Long Island, whose father is fiercely loyal to the British, who spies for Washington's army. The show has one of the most hateful characters you could imagine, playing a real-life character, in Major John Simcoe who is at loggerheads with most of his British colleagues.
The core of the story is true. Relationships and characters have been exaggerated or shifted in time.
At the end of Season 3, Benedict Arnold has just betrayed the Americans and West Point academy because they didn't give him enough responsibility or credit.
It was funny when we were in London, we saw a house with a blue plaque saying "Here lived Benedict Arnold, American patriot". In the US, his name is synonymous with traitor.