Actually, “The Sound of Music” was not that accurate...the father in reality was a very warm loving father, Maria had a real streak of anger...the family had sold the rights to the story and had no say in the movie...there are several good books on the real story...
‘Soldiers’, when compared to the book, was a close as they could be considering the battle took three days over three different areas, and the movie was only 2 1/2 hours, I think...I know the producers worked closely with some the people portrayed to make it as close as possible
Supposedly the real Maria hung around the set, trying to get on camera. She was a real piece of work - it was the father that was the sweet guy.
There is a scene where she was a walk on.