Police arrested an 18-year old Hamilton man on Dec. 23, following an assault at a McDonald's on the Mountain.

On Tuesday Dec. 20 at 6 p.m. police responded to a disturbance on Upper Wentworth St. near Mohawk Road.

Detective Sergeant David Beech said an intoxicated man and a group of youths were causing the disturbance, when a bystander tried to step in.

"The victim was a good Samaritan who tried to step in and help out," he said.

The individual sustained an injury and was taken to hospital with serious but non-life threatening injury. He remains in hospital.

The man is being charged with aggravated assault, and was released with a court date set for January.

Anyone with any information they feel could assist the police are asked to contact Det. Sgt. David Beech at 905-546-3851 or call Crimestoppers at 905-522-8477.