We went to Dunkirk yesterday- not the place, the film. I found it excellent. It is set in three 'chapters' - land, air, and sea.
The first is the beach area at Dunkirk itself, and particularly the Mole, a pier built out into the ocean so that troops could board ships which were unable to come right up to the shallower waters. British troops [and some French and other nationalities] retreating from the Germans had ended up stranded on the beaches of Dunkirk, awaiting rescue by the British navy. But lined up on the beach - in orderly British queues [a historically correct fact] or waiting patiently along the Mole to board the next vessel, these 400,000 men were at the mercy of the Luftwaffe.
Kenneth Branagh plays Commander Bolton, who masterminded the evacuation and proves yet again what a fine actor he is. He has said that Christopher Nolan, the director didn't let anyone get 'soft' - once you put on the uniform, that was it -no sitting down, no cups of tea. Fight on till it was done, and the filming was completed.
Then the air - this section shows the bravery of the British Spitfire pilots who went out to try and shoot down the German planes which were attacking the minesweepers at sea, and the men on the beaches.
Listen out for the distinctive voice of Michael Caine - never seen but he is heard, as a radio operator in conversation with a pilot. The shots of the planes, against the blue sea and sky were utterly stunning.

And finally the sea - Mark Rylance, an ordinary middle aged man from Dorset*, with a little boat, answers the call. He sets sail with his son, and a young family friend, to travel to France and rescue some stranded soldiers. *People tend to recall that the flotilla left from the Kent coast - this was a nod to those other amateur sailors from the other places who bravely set out across the Channel [you can see another of Dorset's Dunkirk Boats at Poole Lifeboat Station]
I'd happily watch MR in anything - he is such a gifted guy. I am not giving any plot spoilers- other than to say there were some very clever and poignant twists to the story.
Oh, and Harry from One Direction is in it too. Yes, he is a competent actor, and yes I agree with Nolan's view that it was important to use young, inexperienced boys - because so many of those lads waiting on the beaches in June 1940 were young and terrified.
I hate war and violence. It is clear from the ads and trailers shown before the film, that they expect the audience to be mostly blokes. But this film does not set out to glorify war - it shows bravery, and willingness to make self sacrifice. It also shows the instinct for self-preservation, and how sometimes that may affect the choices people make, or the way they treat others. It demonstrates how the combined determination of a few, relatively insignificant, individuals can overcome the great, evil war machine.
The background music is excellent - the clever use of the heartbeat device was particularly good at moments of suspense.
But when the flotilla of little ships arrived, and the music segued into Elgar's Nimrod, I lost it completely, and was sitting there in the cinema weeping.
This film celebrates those brave soldiers who managed to come home, and honours the memory of those who didn't - and acknowledges the courage of those who risked everything to bring them back.
You can read Churchill's speech after Dunkirk here - but you probably know these lines already [yes, they do occur at the end of the film]
We shall go on to the end, we shall fight in France, we
shall fight on the seas and oceans, we shall fight with growing confidence and
growing strength in the air, we shall defend our island, whatever the cost may
be, we shall fight on the beaches, we shall fight on the landing grounds, we
shall fight in the fields and in the streets, we shall fight in the hills; we
shall never surrender, and even if, which I do not for a moment believe, this
island or a large part of it were subjugated and starving, then our empire
beyond the seas, armed and guarded by the British fleet, would carry on the
struggle, until, in God's good time, the new world, with all its power and
might, steps forth to the rescue and the liberation of the old.
I know there were a few changes for dramatic purposes - but it's pretty accurate as far as I can tell. It had scary moments, poignant moments, and uplifting, joyful moments. I found it inspiring, challenging, and thought provoking.
Personally, I would rate this film 5*