A teenager was kidnapped, stripped, beaten and abandoned in a country lane by the jealous ex-lover of his new girlfriend.
Simon Buckley, 18, from Haywards Heath, was bundled into the back of a car and driven to the remote spot where the "revolting" attack was carried out.
He suffered a fractured jaw, black eyes and bruising as he was repeatedly punched by Michael Collins, wearing a knuckle-duster on his fist.
Yesterday Collins, 18, of Coopers Close, Burgess Hill, was sentenced to two years at a young offenders' institution.
He admitted charges of false imprisonment, causing grievous bodily harm and possession of an offensive weapon.
His brother Simon Collins, 21, of Eastwick, Lindfield, was sentenced to six months in prison for possession of an offensive weapon and affray.
Hove Crown Court heard how Collins had become jealous on learning his ex-girlfriend had started a relationship with Mr Buckley.
The pair arranged to meet at a pub in Haywards Heath to sort out their differences but the meeting turned sour.
Collins grew angry, taking the teenager outside, where he started punching him.
He dragged him into nearby Clair Park, where he continued to quiz him for an hour about his relationship.
Collins then made a phone call to his brother.
His brother arrived with a friend and Mr Buckley was told to get in the car, which was driven to Rocky Lane.
Simon Collins handed his brother a knuckle duster. The teenager was hit in the face. The bone around his left eye was fractured.
The trio tore off some of Mr Buckley's clothes, scattering them in fields, before driving off.
He was later taken to the Princess Royal Hospital for treatment.
Both brothers had pleaded guilty at an earlier court hearing to the charges.
Philip Meredith, representing Michael Collins, told the court it was a crime of passion.
He said: "Many men of all ages experience jealousy. Young men particularly not only feel the passion but are less able to deal with it because they are less mature."
Sentencing the pair yesterday, Judge Austen Issard-Davies said they had acted callously.
He told Michael Collins: "I am told you lost control of yourself but you put yourself in that situation and I believe you were conscious of the sustained cruelty you were inflicting."
And sentencing his brother he said: "It is clear you knew what was happening when you answered his call.
"It was with revolting callousness you congratulated your brother on his handiwork. You gave him the knuckle duster knowing it was going to be used on a terrified man offering no resistance."
After the case, Mr Buckley said he was pleased with the sentences.
He said: "Now all I want to do is get on with my life."
His father said: "The last ten months have been hell.
"The strain on everybody has been enormous. We are pleased it is over."
The detective in charge of the case DC Ron Coxhead, of Haywards Heath CID, said: "Three families have had their lives ruined by a jealous, unprovoked attack. It is the end now as far as the family are concerned. They can put all this behind them."
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