The brawl happened in Gipsy Lane between 10.45pm and 10.53pm on Sunday.
Both men suffered injuries believed to have been caused by a knife and one had to be taken to the Norfolk and Norwich University Hospital for treatment.
A teenage boy and girl were arrested on Monday in connection with the incident.
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They were taken to Wymondham Police Station for questioning and have since been released on bail.
Another teenage boy was arrested today and was taken to Wymondham Police Station for questioning where he remains.
Anyone who witnessed the incident or has information is asked to contact Norfolk Constabulary quoting crime reference 36/25243/24.
The brawl happened in Gipsy Lane between 10.45pm and 10.53pm on Sunday.
Both men suffered injuries believed to have been caused by a knife and one had to be taken to the Norfolk........