For a better, and IMO, more accurate telling of that evacuation, check out Dunkirk (1958) with a great cast of British actors. This one has two stories, one of a squad making its way to the beach and the other some civilians in the UK who own small craft going over to pick them up.
One scene got to me. A little cabin cruiser is approaching the beach and the skipper says "Head over to that pier." only to discover the "pier" is a column of soldiers standing chest deep in the water.
The Sgt at the head of the line asks how many can they take and the skipper says "Twenty". The Sgt counts off 20 and says "Off you go.", then gets back to the head of the line. They wait for another boat, which never comes.
This new 1 had no leading characters even. No real acting unless you call feigning fear in a movie acting.
Merrill’s Marauders is my Favorite, hubby’s uncle was a member of Merrill’s original band. Came home with bad PSTD.