A 56-year-old man’s shoulder was broken and eye socket fractured after he stepped in to help McDonald’s staff who were thought to be being harassed by a gang.
The victim was assaulted after a fight broke out when he intervened at the Barnsdale Drive restaurant in Westcroft at 2.20am on Saturday morning.
He was taken to Milton Keynes General Hospital where he is currently receiving treatment.
One of the offenders is also thought to have sustained an injury to his nose during the incident.
There were a number of people in the area at the time of the offence, and officers would like to speak to anyone who has any information about what happened.
A scene watch was in place on Saturday and officers were in the area conducting enquiries.
If anyone has information regarding this incident, call Det Con Greg Hughes on 101.
If you don’t want to speak directly to the police contact Crimestoppers anonymously on 0800 555 111 or online at crimestoppers-uk.org
No personal details are taken, information is not traced or recorded and you will not go to court.