LONDON, ENGLAND - AUGUST 04:  Camilla, Duchess of Cornwall, center, attends a a candlelit vigil and prayer service to commemorate the centenary of the outbreak of the First World War at Westminster Abbey on August 4, 2014 in London, England. Monday 4th August marks the 100th anniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11pm that Britain was to enter the war after Germany had violated Belgium neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of causalities. A series of events commemorating the 100th anniversary are taking place throughout the day.  (Photo by Sang Tan - WPA Pool /Getty Images)