A man was taken to hospital after a fight near St Helier's waterfront in the early hours of Saturday morning.
Police were called after a group of men were seen fighting on La Route de la Liberation at around 1:50am.
Officers say it happened on the harbour-side approach to the Elizabeth Harbour, near Victoria and Albert Place apartments.
Two men were arrested, interviewed, and released on bail. The man taken to hospital was treated and then sent home.
Jersey Police say their enquiries are still ongoing.
Anyone who saw what happened, or who was driving in the area and may have dashcam footage, is asked to call 01534 612612 or Crimestoppers anonymously.

Details announced of free childcare for two and three year olds
18-year-olds to have access to Jersey social housing
CI ferry operators to work together to improve inter-islands travel
'Show up and play' football games to tackle festive loneliness
New website helps children and families navigate the digital world
More time in Jersey for French day-trippers
Rapist jailed more than two decades after his crime
Jersey Airport to see 20,000 passengers in the run up to Christmas