A 6ft 4ins thug who attacked a man more than twice his age was left with a dislocated shoulder after the pensioner floored him with two right hooks.
Former Army boxing champion John Cokeley said Mark Pearce ‘picked on the wrong man’.
The 71-year-old was at home watching TV in his slippers when he heard Pearce rowing with a neighbour.
Mr Cokeley went outside and told Pearce to calm down when the 34-year-old punched him in the face, Exeter Crown Court heard.
Pearce hit Mr Cokeley in the head, smashing his glasses and causing a black eye.
But the pensioner, a professional welterweight undefeated in the Army, got to his feet and floored Pearce with a ’roundhouse blow’.
Pearce managed to get up but Mr Cokeley, who is 5ft 10ins, floored him for a second time with a punch to the stomach.
Pearce denied causing actual bodily harm, claiming he was attacked by the ex-boxer and was acting in self-defence.
But he was found guilty today and sentenced to a six month prison sentence suspended for two years.
Pearce was also given a 12 month supervision order and ordered to pay £175 costs.
Speaking after the hearing, Mr Cokeley, who served around the world in the Army from 1957 to 1968, said: ‘It was 10.15pm and I was watching TV.
You really should respect your elders. It’s not hard and saves you from vicious right hooks.