The incident happened just after 2am on Sunday, 26 March, in Middle Gate in Newark.
Two men had been on a night out and were making their way to another pub when they were attacked by three men.
A 39-year-old man was knocked unconscious and sent to Queen’s Medical Centre.
His brother was left with minor injuries.
Police released a CCTV image to trace those responsible. Since the appeal, a 25-year-old man from Newark has been arrested for assault.
The victim is recovering in the hospital but is still in a serious but stable condition.
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