TOPSHOT - Britain's Princess Catherine, Duchess of Cambridge, and Britain's Prince William, Duke of Cambridge, lay flowers at the headstones of soldiers who fell in World War One at The Tyne Cot Commonwealth War Graves Cemetery in Zonnebeke on July 31, 2017, as part of a series of commemorations for the 100th anniversary of the Battle of Passchendaele. 
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 / POOL / Melanie Wenger        (Photo credit should read MELANIE WENGER/AFP/Getty Images)