Assertion: barbed wire | /r/CapableOf | prove difficult to destroy
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text: Barbed wire, which could and often was laid to a formidable depth, proved difficult to destroy, although high explosive artillery was often launched so as to clear the enemy lines of wire; all too often however the wire remained uncut, as was disastrously the case for advancing British forces on the first day of the Battle of the Somme in 1916.