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1st July 1916: British troops climbing from their trench on the first day of 'The Big Push' on the Somme during World War I. (Photo by Morgan-Wells/Hulton Archive/Getty Images)

1st July 1916:  British troops climbing from their trench on the first day of 'The Big Push' on the Somme during World War I.  (Photo by Morgan-Wells/Hulton Archive/Getty Images)