Catherine, Duchess of Cambridge, accompanied by Major General Ben Bathurst (L), attends the Household Division's 'Beating Retreat' at Horse Guards Parade on June 6, 2019 in London, England. Beating Retreat originated as a military drum call that can be traced back to the 16th Century, which has now evolved into a musical ceremonial event, comprising of a display of military music, horsemanship, precision drill, pageantry and fireworks.