"Cowardly" trick-or-treaters broke a man's cheekbone by repeatedly punching him in the face on Halloween night outside his Northamptonshire home.
The victim, 43, was attacked after he confronted a gang of teenagers who he suspected had thrown eggs at his house in High Street, Silverstone.
He was taken to Northampton hospital with multiple facial injuries.
A Northamptonshire Police spokesman said: "This was an unprovoked and cowardly attack."
One of the attackers in described as 6ft 1in, of medium build and was wearing a dark coloured hooded top, a white baseball cap and dark jogging bottoms.
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