The Longest Day
1962Why it's similar — The 1962 Darryl F. Zanuck production's multi-perspective dramatisation of the D-Day landings is the closest formal precedent for Dunkirk — both films refuse the single-protagonist war-movie convention and instead build their narrative from multiple national, branch-of-service, and rank perspectives on a single defining 20th-century operation. The rhyme is the conviction that the right scale for a major military event is the ensemble rather than the individual.