THIEPVAL, FRANCE - JUNE 30: Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge attend a vigil to commemorate the 100th anniversary of the beginning of the Battle of the Somme at the Thiepval Memorial on June 30, 2016 in Thiepval, France. on June 30, 2016 in Thiepval, France. (Photo by Pool/Samir Hussein/WireImage)
