The Longest Day, which remains (with the exceptions of John Wayne’s piss poor contribution playing a man who was half his age, and Sean Conneries lamentable attempt at an Irish accent) an utterly remarkable film for its ambition in telling different aspects of the story and its attempt at accuracy, employing so many of those who were really there as advisors.
Waterloo – for the sheer scale of the battle scenes “Raise high the black flags children, no pity, no prisoners…”
Come and See, for being just, well, haunting, in its portrayal of the work of the german death squads as they advanced in to Russia
Peter Watkins 1964 version of Culloden
but the best of all: Went the day well