Police are investigating after a prison officer was injured during a seven-hour riot at HMP Stocken.
The Ministry of Justice confirmed violent disturbance broke out at the medium-security prison in Rutland at about 17:00 GMT on Saturday.
One officer was briefly taken to hospital with a minor injury.
Specially-trained prison officers, similar to riot police, had to be deployed and full control of the jail was regained shortly after midnight.
Police are now investigating the prisoners believed to be behind the rioting.
There was a similar disturbance involving 60 prisoners at the jail in 2015.
A Prison Service spokeswoman said: “Our highly-skilled staff successfully resolved an incident on one wing at HMP Stocken.
“One officer was taken to hospital with a minor injury, and those responsible will be referred to the police.
“We are investing £2.75 billion to improve prisons and increase security, and giving staff body-worn cameras, police-style restraints and PAVA pepper spray to allow them to do their jobs more safely.”