I noticed that at one point, a patriotically painted drum in the Continental Army had a field of blue with 12 stars in a circle and 1 star in the center, so I looked up a flag timeline to see if or when a flag like that would have been used, since there were so many during the war. I went to http://www.ushistory.org/betsy/flagpics…. which was quite informative. That type of flag was first used in 1777 by the 3rd MD Regiment, and was used in the Battle of the Cowpens January 1781. I didn’t see this flag anywhere in the movie but on a drum, or any indication of individual regiments, but this seems another attempt at a historically accurate detail without confusing the public.
For an account of the Battle of Cowpens, see http://www.revolutionarywararchives.org/…
The actual battle account begins about halfway down the page, and at the end is “Tarleton, surprisingly enough, was not blamed by Cornwallis for the loss at Cowpens. He was captured with Cornwallis at Yorktown some nine months later. Upon returning to England, he was viewed as a gallant soldier and retired from the British Army as a full General.”
As Dr McClurken said, Tarleton survived, went back to England, and lived well. He obviously did not turn into the sort of “I’ll have a bad reputation because of my atrocities so I can’t go back” person he expressed concern about to Cornwallis in the film, asking for land in Ohio.