The incident occurred at around 10pm on Tuesday, August 31.
It is reported that a group of men have approached the victim and assaulted him by punching and kicking him, leaving him with a black eye, cuts and mild concussion.
The victim fell to the floor in the attack and the suspects have continued to kick him multiple times to the head.
The victim is in his 30s. Police said he didn't need hospital treatment after the assault.
If you witnessed this unprovoked attack or have any information that could assist officers with their investigations, please contact Wiltshire Police on 101 and quote crime reference number 54210085102.