A father and son headbutted and glassed two men in a bathroom during a 40th birthday party.
One of the men had to have pieces of glass removed from his forehead after the attack last year.
Andrew Scott Murphy (25) received 15 months in prison for wounding while his dad Andrew Murphy (48) was ordered to work 140 hours unpaid and compensate his victim with £350 for causing actual bodily harm.
The incidents happened in the evening of December 13 at Peterborough Sports and Leisure Club in Lincoln Road.
Andrew Scott Murphy was described as “making a nuisance of himself” because he was encouraging a man at the party to have another shot of alcohol.
The man, who was already feeling the effects of having drunk too much, was eventually taken off in an ambulance.
Murphy senior was then said to have been confronted by Colum Burke over his son’s behaviour before a further confrontation between the two men took place in the bathroom.
It was then that Ronnie Leishman became involved in the dispute before being glassed in the forehead by Andrew Scott Murphy, although nobody could remember the manner in how it happened.
Andrew Murphy, who then tried to get through to his son, was said to have been prevented from doing so by Mr Burke.
In response, he then delivered what was described by Tim Brown, prosecuting, as a “classic headbutt” which left Mr Burke needing two stitches.
Mr Leishman had to have three pieces of glass removed from his forehead before receiving six stitches.
Father and son were sentenced at Peterborough Crown Court on Friday November 28 having already pleaded guilty to their charges.
Charles Falk, defending for Andrew Scott Murphy, indicated that his attack was not pre-meditated and that he did not intend to use a glass bottle as a weapon.
“It seems to be a moment of madness,” he said.
“He says he realises alcohol is a problem and is weary of drinking. He’s stopped going out drinking in pubs and clubs because it worries him.
“Everyone says when he’s not in that situation he is a calm, approachable man.
“He’s very sorry for what he has done.”
Murphy junior had previous convictions for causing actual bodily harm.
His father, Andrew Murphy, also had a previous conviction for causing actual bodily harm, although it was pointed out by Charles Myatt, defending for him, that it was over a quarter of a century ago.
He also asked for his Murphy’s guilty plea to be taken into account when it came to sentencing.
“He wanted to remove his son and prevent a further incident. He’s a hard working family man,” he added.
Sentencing, Judge Sean Enright said: “I’ve seen the photos and it is an unpleasant site. It must have been very distressing.”