On 4 June 1913, socialist suffragette Emily Davison was seriously injured while trying to grab the bridle of the Kings horse during the Derby at Epsom, and died 4 days later. Though often reported as a suicide attempt, this is actually very unlikely, and she was probably trying to attach a suffragette sash to the horse. A militant member of the movement, she had previously carried out arson attacks, property damage, had been arrested for assaulting police and attempting to stone government cabinet ministers, and was jailed and force-fed on a number of occasions. This is an overview of militant suffragette tactics at the time: https://libcom.org/history/violence-suffragette-movement