A man was attacked with weapons including a power drill when a group of up to 50 armed men descended on his family home, Supreme Court heard.

According to victim Temasgan Furbert, 23, one of the attackers switched the drill on and used it to bore into his chest and behind his ear. Seven men from St. George's are on trial, accused of participating in the incident in Hamilton Parish that left Mr. Furbert badly injured.

Prosecutor Robert Welling told the jury during his opening speech: "They set about him with a brutal and sustained assault causing him to lose consciousness. As a result of being struck by helmets, fists, feet, bats, machetes and a cane, the complainant suffered numerous injuries.

"They were mainly to his head and upper body and it included a very very nasty tear on his lip for which he required plastic surgery, and a drill being used behind his ear by one of these defendants caused a severe cut."

Those accused are Detroy Smith, 24, Kyle Tannock Williams, 28, Damon Darrell, 28, Bennett Phipps, 26, Allan Douglas, 22, Kiawan Trott, 25, and Kiwaun Gilbert, 23.

They're charged with wounding Mr. Furbert with intent to do grievous bodily harm and damaging the windows of his sister's home. Douglas and Trott are said to have been armed with machetes while Tannock Williams is alleged to have had a baseball bat. They deny the charges.

Mr. Welling said estimates vary of the number involved in the incident on the night of February 27 last year but it's in the range of 20 to 50.

He alleged that the group was "intent on revenge" over an incident at Hamilton Parish Workman's Club the night before when two men from St. George's named Brandon Trott and Jade Foggo got into a fight and Mr. Trott took Mr. Foggo's neck-chain.

Neither is a complainant or defendant in the court case. However, Mr. Furbert, a friend of both, told the jury he tried to break the fight up and pledged to retrieve the chain.

According to Mr. Welling, the altercation prompted a large number of men with weapons to travel to the club later, arriving in a minibus, a car and on bikes.

"They were looking for Brandon Trott, who's the person that took the chain, but after that they decided to pick on Temasgan Furbert because he's the one they thought they could find," he told the jury. They left after smashing some windows.

According to bartender Yasmine Cann, the first witness for the prosecution, the group numbered 30 to 50 and they were all masked. She could not identify any.

According to Mr. Welling, that triggered the chain of events that led the group of armed men to Mr. Furbert's family homestead in Midland Heights Road the following night.

First they smashed the windows on three sides of an apartment where Mr. Furbert's sister lives with her husband and children, in what Mr. Welling described as a "very frightening incident for the family".

Mr. Furbert lives at the back of the premises. He told how he spotted a group of around 20 to 25 people including Tannock Williams, Gilbert, Trott and Douglas who said "just get him" and "where's Brandon?"

He ran off, but was chased and jumped on by the group as he tried to scale a six-foot fence. He said Trott pulled him off the fence and attacked him with Tannock Williams, Phipps, Smith, Douglas and Gilbert.

"They were kicking and hitting me with helmets and stuff like that and a cane, a machete, a bat, a drill a power drill something like a Dewalt power drill," he said.

He named Phipps as the person who used the drill on his chest and behind his ear, saying he saw him and recognised his voice.

"It was on. Placed against my skin," he said.

Mr. Welling told the jury Mr. Furbert is the only witness who can identify the alleged attackers, who he's known for many years previously from school and socialising.

"This case hinges principally on your view of the truthfulness, honesty and integrity of Temasgan Furbert when he gives evidence to you during the course of this trial," he told them.

The case continues with more evidence from Mr. Furbert. It's expected to last for three to four weeks.