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  • Young people lay wreaths during a service to mark the 100th anniversary of the start of the Battle of the Somme at the Commonwealth War Graves Commission Memorial on July 1, 2016 in Thiepval, France. More than 1 million people were killed, wounded or went missing during one of the bloodiest battles of World War I.
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  • French President Francois Hollande, Prime Minister David Cameron, Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge and Prince Harry attend a service to mark the 100th anniversary of the beginning of the Battle of the Somme at the Thiepval Memorial to the Missing on July 1, 2016 in Thiepval, France.
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  • French President Francois Hollande and Britain's Prince Charles walk past French Republicans Guards during a ceremony marking the anniversary of the Battle of the Somme, at the Thiepval Memorial, northern France, July 1, 2016.
    Thibault Vandermersch/Pool photo via AFP/Getty Images
  • Dignitaries lay wreaths during a service to mark the 100th anniversary of the start of the battle of the Somme at the Commonwealth War Graves Commission Memorial on July 1, 2016 in northern France.
    Gareth Fuller/Pool photo via Getty Images
  • Prince Charles and Camilla, Duchess of Cornwall, attend the The Somme Centenary Commemorations, in Thiepval, France, July 1, 2016.
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  • Men dressed as WW I soldiers prepare to fire a cannon during a ceremony marking the centenary of the deadliest battle of WWI, July 1, 2016 at the Thiepval WWI cemetery, northern France.
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  • Prince Harry and the Duke and Duchess of Cambridge attend a service to mark the 100th anniversary of the start of the Battle of the Somme at the Commonwealth War Graves Commission Memorial in Thiepval, France, July 1, 2016.
    Andrew Matthews/WPA Rota/Nunn Syndication via Polaris
  • People shelter from the rain as they wait for the start of a service at the Ulster Memorial Tower to mark the 100th anniversary of the start of the Battle of the Somme at the Commonwealth War Graves Commission Memorial in Thiepval, France, July 1, 2016.
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  • Britain's Prime Minister David Cameron prepares to lay a wreath during the Somme centenary commemorations in Thiepval, northern France, July 1st, 2016.
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  • The Kings Troop Royal Horse Artillery pass the Prince of Wales, French President Francois Hollande, Prime Minister David Cameron, the Duchess of Cornwall, the Duke and Duchess of Cambridge and Prince Harry and VIPs at a service to mark the 100th anniversary of the start of the Battle of the Somme at the Commonwealth War Graves Commission Memorial in Thiepval, France, July 1,2016.
    Gareth Fuller/WPA Rota/Nunn Syndication via Polaris
  • Attendees don raincoats during a ceremony marking the centenary of the deadliest battle of WWI, July 1, 2016 at the Thiepval WWI cemetery in northern France.
    Thibault Vandermersch/Pool photo via AP
  • A man stands guard by the Croix du Sacrifice - Cross of the Sacrifice ahead of a memorial ceremony marking 100 years since the World War I Battle of the River Somme, on July 1, 2016 in Thiepval, France.
    Stephane de Sakutin/Pool photo via AFP/Getty Images
  • A member of military walks through grave markers on June 30, 2016 during events on the 100th anniversary of the beginning of the Battle of the Somme at the Thiepval memorial to the Missing, in northern France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated.
    (Steve Parsons/Nunn Syndication via Polaris