The Duke of Cambridge came to the aid of the Queen's representative in Essex when he took a tumble during a royal visit.
William and others rushed to help Jonathan Douglas-Hughes, vice lord-lieutenant of Essex, when he appeared to slip on wet pavement.
The Duke and Duchess had just arrived at Stewards Academy in Harlow for a visit when the mishap happened.
Mr Douglas-Hughes, who was wearing his ceremonial uniform complete with sword, fell backwards as the Duke was introduced to local dignitaries.
A gasp went up from around 30 well-wishers as he landed on his back and he was helped to his feet by William and others.
Mr Douglas-Hughes turned to William and said 'Sorry about that', and the Duke replied 'No, it's all right'.
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