Warwick Castle trebuchet fireball demonstration
Footage showing the launch of a fireball from a trebuchet - thought to have caused a blaze which broke out minutes later - has emerged.
Eyewitness Dr Martin Lees - who filmed the demonstration at Warwick Castle - said an historic boathouse caught fire after the projectile landed nearby.
Dr Lees said the fireball landed at least 10m (33ft) from the boat house at the climax of the demonstration.
No-one was hurt in the blaze.