Britain's Prince William (C), Duke of Cambridge and his wife Kate, the Duchess of Cambridge, arrive to attend a ceremony marking the centenary of the battle of Passchendaele, one of the bloodiest of World War I during the Last Post ceremony at the Commonwealth War Graves Commission in Ypres (Menin Gate) Memorial, in Ypres Western Flanders on July 30, 2017. 
The battle of Passchendaele, also called the third battle of Ypres, took place between July 31 and November 6, 1917 in Passendale, West Flanders. / AFP PHOTO / JOHN THYS        (Photo credit should read JOHN THYS/AFP/Getty Images)