I am a Greer Garson fan, and am familiar with that film.
I was embarrassed to hear Christopher Nolan, the British director of the film interviewed on NBC. Apparently the anchor thought that Dunkirk was a rather obscure battle that most people (Americans) would not be familiar with.
You should have seen Nolan’s face.
There was an earlier posting which brought out insightful contributions from FR’s about that historic episode which made it learn something meaningful. I also urged readers view “Mrs Miniver” in that one. If Noland were to review this posting and some of the comments, sans yours, the look on his face is understandable.