A festive night out left a man needing hospital treatment for stab wounds on Friday evening.
The attack happened at about 11.45pm, in an alleyway near The Angel Inn, on Sheep Street, on the night which is traditionally the busiest of the year for emergency services.
A 27-year-old man was walking along the alleyway when he got into an argument with the offender and they were involved in an altercation.
The victim suffered four superficial stab wounds, one to his chest, one to his left arm and two to his left groin area.
He was taken to the John Radcliffe Hospital in Oxford.
His injuries were serious but not life-threatening.
Det Sgt Mike West, from Bicester Force CID, said: “This kind of incident is rare for Bicester and it is important to note that the victim is believed to have been known to the offender.
“We would also like to reassure the public that we are doing all we can to bring those involved to justice.”
A 27-year-old man from Bicester was arrested on Sunday on suspicion of assault occasioning GBH.
He has been bailed until February 6.
It was reported by an onlooker that earlier in the same area there had been an argument over money between a man and a woman with another man.
Police are keen to track down the people involved in that row, as they believe they may be able to help with the investigation.
Anyone with information about the incident should contact Det Con Joseph Stevenson, from Banbury Force CID via the 24-hour enquiry line 101.