Three men tried to force their way into a house in Salisbury Road, Preston.
Police said at 10pm on Sunday, March 9, the man was confronted by one man at his front door before two others appeared, one armed with an iron bar. All three tried unsuccessfully to push past him, and punched him in the head.
The men, described as Asian, ran to a waiting dark coloured vehicle which drove off towards Fishergate Hill.
Call police on 101.