A man is being questioned about a fight on Windsor Road.
Jersey Police were called to the old Caesarea court just before midnight last night (Thursday 6th June).
A 33 year old was arrested at A& E on suspicion of Grave and Criminal Assault and remains in custody.
Two other men suffered minor facial injuries.
Police are trying to trace an unknown fourth man they think was involved.
Anyone who saw what happened is asked to call 612612, Crimestoppers anonymously on 0800 555 111 or via their online form at crimestoppers-uk.org

More Channel Island musicians to get funding for gigs
Daughter of L'Ecume II skipper and former Jersey Reds Captain join police force
Speed limits to be cut on 52 St Ouen roads
Experts identify aspects of Assisted Dying Law that raise issues
Deputy decries £280k unspent IVF funding despite demand
Aurigny promises average Guernsey-Jersey air fare will be £70 one way
Missing moggy survives Storm Goretti and returns home after five weeks
A Channel Islands success story to expands to Dubai