A man was flown to hospital by air ambulance after a horse kicked him in the head and injured his arm at Crowland Show on Saturday morning.
Show secretary Helen Turpin said the horse reared up and a group of people were trying to get control.
“It kicked the man in the head and the other hoof went down his arm,” she said.
The injured man, who owns the horse, was flown to Peterborough City Hospital with his wife – who was also slightly hurt. The man is believed to have been allowed home on Sunday.
A second man was also slightly hurt but remained at the show.
It is believed to be the first accident of its kind in the show’s history.
Around 3,000 people attended the event on Snowden Field and organisers were delighted with the turnout.
Horse classes were really busy with events including jumping, dressage and driving.
Other attractions included a fairground, classic cars and vintage tractors and a display by German Shepherd owners.
Baby show winner Sebastian Lawrence – born on February 21 this year – was presented with his prize by his uncle, Daniel Frisby, who won the contest 20 years ago.
Anne Broderick said: “We had 16 entrants and they were all beautiful – it’s not a record as we’ve had as many as 36 with five sets of twins.
“It was a marvellous day, really good.”
Show chairman Tom Henfrey said money raised pays for future shows and spare cash goes to the community.