Ferom L-R, French President Francois Hollande, Britain's Prime Minister David Cameron, Prince William and his wife Catherine, the Duchess of Cambridge and Prince Harry arrive to attend a ceremony at the Franco-British National Memorial in Thiepval near Albert, during the commemorations to mark the 100th anniversary of the start of the Battle of the Somme, northern France, July 1, 2016. REUTERS/Philippe Wojazer