In the early phases of WWII, 400,000 allied forces lost the Battle of France and were waiting for annihilation on the beach of Dunkirk. This film shows that impending doom and the desperate struggles of soldiers to somehow survive. This is a technical masterpiece achieved with real locations, huge number of extras and practical effects and the music plays a big part. But lack of character development and PG rated violence doesn't allow you to fully immerse into the film, and thats why this is my least favourite Christopher Nolan film.