James Hemming pleaded guilty to wounding with intent after a 17-year-old girl was badly injured in Fratton.
Mobility Scooter Man Fights Off Robbers
A man on a mobility scooter fought off three youths who tried to rob him by punching one of them in the face.
The 61-year-old man was riding his scooter in Waterlooville towards shops when he was stopped by three youths who asked for his money.
One of the youths produced a knife but the victim punched him in the face and made off on his mobility scooter.
Detectives are appealing for information following the incident last week.
The youths were described as aged around 14 or 15 and one may have suffered a facial injury due to being hit by the victim.
Detective Constable Kathryn Smithers said: ''I would want to hear from anyone who can identify a possible suspect from the description, particularly due to the possibility of a recent facial injury.''
Dorset and Hampshire officers will be carrying out extra patrols until New Year's Day.
Hampshire Police have dealt with more than 100 cases in a year of people being blackmailed over intimate webcam images.
£600 was stolen after workers at Coral on Columbia Road were threatened with an axe.
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