VIMY, FRANCE - APRIL 09: Prince Charles, Prince of Wales, Prince William, Duke of Cambridge and Prince Harry visit the tunnel and trenches at Vimy Memorial Park during the commemorations for the centenary of the Battle of Vimy Ridge on April 9, 2017 in Vimy, France. The Battle Of Vimy Ridge was fought during WW1 as part of the initial phase of the Battle of Arras. Although British-led, it was mostly fought by the Canadian Corps. A centenary commemorative service will be held at the Canadian National Vimy Memorial in France attended by the Prince of Wales, The Duke of Cambridge and Prince Harry and representatives of the Canadian Government. (Photo by Tim Rooke - Pool/Getty Images)