FRANCE-BRITAIN-HISTORY-WWI-ANNIVERSARY-MEMORIAL

Britain's Duchess of Cambridge Catherine (C) flanked by her husband Britain's Prince William (R), attends the memorial ceremony on July 1, 2016, in Thiepval, during which Britain and France will mark the 100 years since soldiers emerged from their trenches to begin one of the bloodiest battles of World War I (WWI) at the River Somme. Under grey skies, unlike the clear sunny day that saw the biggest slaughter in British military history a century ago, the commemoration kicked off at the deep Lochnagar crater, created by the blast of mines placed under German positions two minutes before the attack began at 7:30 am on July 1, 1916. (Photo by STEPHANE DE SAKUTIN / AFP) (Photo by STEPHANE DE SAKUTIN/AFP via Getty Images)