War movies can be a lot of different things. Some are about winning and victory. Others are about horror and trauma. Dunkirk would probably be described as the best battle for hope and survival. The theater is not because an army can not defeat another, but because it can escape from an army that will be defeated. Strong emotions that can arise from such a situation, especially fear. Some moments frighten you from something that will happen. After others scare you, he’s afraid.
Dunkirk is his first film about war and history, Christopher Nolan, but still shows his talent as a filmmaker. There is a sense of detail and a sense of what influences a viewer’s audience.