Faifley youngster Gary Smith, 19, also repeatedly punched and kicked his victim leaving him severely wounded and permanently disfigured and impaired following the violent attack which took place three days before Christmas in 2012 at Orbiston Drive.

Last week he appeared in the dock at Dumbarton Sheriff Court after previously being found guilty at trial.

It was also heard he had punched a 14-year-old boy as he walked home from Faifley’s Skypoint centre a few months earlier.

Malcolm Mcleod, procurator fiscal depute, told the court at around 10pm on Sunday, September 23, 2012, the 14-year-old was heading home with another boy who was a year older when they were approached by a drunken Smith.

He then became aggressive and accused them of picking on his wee brother.

The boys denied his accusations but it appeared he was trying to pick a fight.

Smith then put his face up to the younger boy’s face squared up to him and shouted that he would batter anyone who picked on his little brother before punching the youngster in the eye and making off. The teen was shaken by the attack but managed to gather himself together and head home and tell his mum what happened.

The police were called and Smith was later cautioned and charged.

Mr Rhodes, defending, said Smith was remorseful for his actions towards the 14-year-old and said alcohol had been a factor.

He also said there was some history between Mr Smith and the man he had been convicted of stabbing and added that Smith had previously been seriously assaulted by him.

However, he said Smith’s victim had since moved away from the area meaning there was no longer an issue.

It was also heard that Smith had accepted he was drinking to excess which was something he had to address. However, because of his young age the court was urged to hand him a community payback order instead of imposing a jail sentence.

Sheriff Simon Pender said: “Whatever difficulty there may have been between the complainer and you in the past the jury accepted you perpetrated an unprovoked attack on the complainer with a weapon leading to severe injury, permanent disfigurement and impairment.” Smith, of Craigbanzo Street, was ordered to spend two years in detention and was also handed a concurrent 80 day sentence for punching the 14-year-old.