Commemorations For The 100th Anniversary Of Vimy Ridge [Getty Images]

LILLE, FRANCE - APRIL 09: Prince Charles, Prince of Wales, Prince William, Duke of Cambridge and Prince Harry tour a tunnel made during WWI during the commemorations for the 100th anniversary of the battle of Vimy Ridge on April 9, 2017 in Lille, France. (Photo by Pool/Samir Hussein/WireImage)

WireImage Pool/Samir Hussein