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which was a six-month quagmire started by the British army
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on the 1st of July 1916 and ended roughly November 1916,
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for no gain whatsoever and a million casualties--
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in the middle of it, a part of the British propaganda office,
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it wasn't a ministry until 1918--
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it was all done more or less informally until then--
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they decided to make a film to buck up public morale.
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What they did was they filmed the Battle of the Somme
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while it was being fought.
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But they didn't film the fighting.
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They filmed mock episodes
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where soldiers in training would go over the top