Given the material they had to work with the director et al made a pretty boring little movie. Many technical and editing problems presented, as well as failing to make human characters out of pretty much everyone. Real bravery is presented as bravado with glaringly unrealistic outcomes in many cases. Maybe they tried too hard or maybe no one understood real war so created a pretense of it. Dunkirk is one historical event that really needs at least some overview. Lacking that there is haphazard action. My opinion anyway.