Christopher Nolan's Dunkirk is a marvelous cinematic achievement, and the best way to experience it is not only on the biggest screen you can find, with the biggest sound, but also via Warner Brother's new 4K HDR disc version of the 2017 hit.
Dunkirk, of course, was a terrible defeat for the Allies at the beginning of World War II. The German forces' invasion of western Europe had stranded hundreds of thousands of soldiers, the lion's share of whom were British, between the Axis advance and the English Channel. There they waited either for rescue, or death - depending who got to them first.
That's where Nolan's film begins, literally with a bang as one soldier (well, he wasn't alone originally, but such is war) flees the invaders, climbing a fence and running down narrow streets until he emerges onto the Dunkirk beach to find he's no longer alone: he's just one of those hundreds of thousands of souls with nowhere to go.