The Red Baron is a German biopic by Nikolai Mullerschon from 2008, about the legendary WW1 fighter pilot Manfred Von Richthofen, it was filmed in the Czech Republic, France and Germany, entirely in English to improve its international commercial viability.
Caught the end of this movie one night on TV and wanted to see the whole lot, this movie seemingly has two versions, the English and German versions which are slightly different, the movie bombed in Germany for being too positive and it suffers from a terrible script but good performances from the actors who were acting using a different language than their own, there are a lot of little inaccuracies about the movie (ages, planes, people but nothing I noticed).
The main issue with the movie that people had was his proto pacifist and anti-war leanings it portrays, an affair with a nurse which seems to be more intense than it really was and if it did happen at all ( it's only used to highlight the futility of the war) but in real life there was no basis for this, in the movie he says only to kill the plane but he is known for saying in real life to aim for the man and with two seater planes to kill the observer first before the pilot because until you've silenced the gun firing not to worry about the pilot.
Now you're thinking is their anything good about this movie at all, yes, the effects are really good (the planes are really colourful and well depicted to me) and the air battles are good and exciting and the trench scenery is well done but it could have had a little more action but I always think that, if you get a chance it's worth a watch but nothing more I'm afraid.
No one knows who actually killed him and it remains a mystery to this day with several people claiming the kill, the term flying circus came from it's mobility (tents and trains) and the colourful aircraft, he is credited with 80 victories and some consider he had more.
More information about him here