YPRES, BELGIUM - JULY 30: Catherine, Duchess of Cambridge talks with descendants of those who fought in World War One as they attend commemorations marking the centenary of Passchendale on July 30, 2017 in Ypres, Belgium. Dignitaries and descendants of those who fought are gathering to mark the centenary of Passchendaele, the third battle of Ypres, on 30 and 31 July 2017. The campaign saw intense fighting over 3 months, 1 week and 3 days with historians currently agreeing that both sides suffered losses of around 260,000 casualties each. (Photo by Yui Mok - Pool/Getty Images)