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Zara Phillips knocked down a rail aboard High Kingdom, but Britain still won silver in three-day eventing. (Jamie Squire -- Getty Images)

Zara Phillips knocked down a rail aboard High Kingdom, but Britain still won silver in three-day eventing. (Jamie Squire — Getty Images)

LONDON, ENGLAND – JULY 31: Zara Phillips of Great Britain riding High Kingdom knocks a rail in the Show Jumping Equestrian event on Day 4 of the London 2012 Olympic Games at Greenwich Park on July 31, 2012 in London, England. (Photo by Jamie Squire/Getty Images)