OK, I have got an interesting one - not everybody's taste:
THE BATTLE OF THE SOMME (1916) (Yes, 1916 is the production year)
http://www.imdb.com/title/tt0006405/
In 2005 this film was inscribed on UNESCO's Memory of the World Register for the preservation of global documentary heritage.
You need to find the version of the film that was digitally restored in 2007-8 by the Imperial War Museum’s Film and Video Archive and Dragon Digital Intermediate. It represents a startling improvement on previously released video versions.
Description
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'The Battle of the Somme' was a pioneering battlefield documentary film made by British official cinematographers Geoffrey Malins and John McDowell in June-July, 1916. Though intended as patriotic propaganda, the film gave, for its time, a graphic portrayal of trench warfare, showing dead and dying British and German soldiers. It was released in early August 1916, barely a month after the events it depicted, and
it is estimated that no less than half the population of the UK eventually watched it. It remains one of the most popular British films of all time.
Contemporary cinema-goers hailed it as an opportunity to see the reality of the Western Front for the first time and to share the experiences of the soldiers who were fighting there. The film inaugurated a debate about the on-screen depiction of combat that continues to this day, and is the origin of some of the most widely used and iconic moving images of the First World War.
Actualy, one scene of the film is considered to be fake. There is even a book written about it:
GHOSTS ON THE SOMME: Filming the Battle, June-July 1916
http://www.amazon.com/GHOSTS-ON-THE-.../dp/1844158365
~S~