Two men were attacked by a gang leaving one of the victims with a broken nose.
The other person suffered bruising to his face and back during the unprovoked assault.
Police are appealing for witnesses to the attack, which happened in London Road, Apsley, on Friday, August 30 just after 1am.
The suspects are described as three white men of medium build.
Anyone with information about the assault is asked to contact DC Archi Bagworth via the Herts Police non-emergency number 101.