A man suffered a broken nose when he was attacked moments after a verbal altercation outside a Rothwell pub.
Police have launched an appeal after the incident at about 11.30pm on Saturday (October 19).
The victim left the Red Lion pub in Market Hill and became involved in a verbal exchange with two other unknown men.
He was then assaulted and left with a broken nose, chipped teeth and bruising.
Anyone who saw the incident, or has information about it, should call Northamptonshire Police on 101, or Crimestoppers anonymously on 0800 555111.
Editor's note: A previous version of this story included a description of a suspect. This was based on information provided by police which was incorrect and has since been removed.