Went the Day Well? is one of very few films which I can watch repeatedly. Considering WW2 was still going on, with the outcome far from certain, it was a bold piece of film-making and is one of the most violent films of it's time.
It's not so much propaganda as it is a wake-up call to the rest of the world to realise the danger which is facing them.
It's based on a Graham Greene story called The Lieutenant Died Last, but I've never managed to find a copy of it.