What was this movie about?

Rating: 2/10 (8 January 2018)

Only made it 55 minutes into this major dud of a movie.
That far in and all I could understand was there were lots of soliders on a beach in France (I think) trying to get onto ships. 2 of them were trying harder then the others it seems but I had no idea if they were friends, foes or just happened to be going the same way.
Saw 2 civilian boats commandeered by the British navy to go help get troops out, one of which went on their own without any navy people on it.
Oh and a couple planes were doing something akin to fighting in the skies overhead.
How any of this was connected i have no idea.
The sound was worse then I see on youtube videos, my phone could have done better. When I say it was bad I mean half the dialog was not understandable due to weird background noises and ridiculously loud moments.
Sad since the real story was an amazing moment in history.
As to the rating this movie has here... were do I find the company that does fake ratings for stuff like this so all my posts will be so highly inflated?