Good idea - chop it into four bits and paste into any war movie.
But complete junk if you want to get a flavour of Dunkirk.
That is on good authority.
I showed it to my father:
Machine gunner, rear guard through Belgium and France, Company destroyed by Guderian's tanks at Wormhout, crossed German lines, 4 hours in no-mans land, got on one of last boats out, French Destroyer, dropped off at Cherbourg, joined 52nd Division, finally evacuated again from Cherbourg in small boat, 6 soldiers.
It was nothing like his experience.