Staff from an Aylesbury pub gave first aid to a 17-year-old boy who was injured in an Elmhurst Road altercation.
Workers at the Dairy Maid were locking up for the night when they saw the teen lying in the road nearby.
They quickly contacted the emergency services and looked after the victim until help arrived.
The boy was injured shortly after windows at an Elmhurst Road home were smashed, as well as the windows of a minibus parked in the driveway.
Two men, aged 19 and 20, both from Aylesbury, have been arrested in connection with the incidents.
Dairy Maid manageress Kirsty Shoots praised her staff’s actions.
She said: “There were two groups of lads starting on each other so we had to try and control the situation.
“It was not anything to do with the pub, we just helped out and administered first aid.
“He was in and out of consciousness. He had been hit on the head and had a bad head wound.
“We waited with him until the emergency services arrived.
“He was in the middle of the road and some of our regulars had to help out and control the cars that were going past.”
The boy suffered injuries to his head and stomach in the early hours of Sunday and was taken to hospital.
Police are investigating links between the two incidents.
The arrested men have been released on bail until January 14.
Anyone with information should call police on 101 or Crimestoppers anonymously on 0800 555 111.