Detective Sergeant Stephen Gardiner said: “It was reported that a male, armed with a hammer, called to the door of a house in St Galls Avenue at around 12.45pm on Sunday afternoon.
“Upon answering the door, the female occupant was punched in the face by the male.
“When the husband of the female came to her assistance he was struck a number of times with the hammer and then further assaulted by a woman who joined in the attack.
“The male then broke windows of the house and a car before leaving the scene on foot.
“The man received hospital treatment for head injuries following the incident.
“The male involved is described as being in his late 20s / early 30s, slim to medium build, wearing glasses, a baseball cap, grey tracksuit bottoms and a dark coloured top.
“A 32 year old woman was arrested on suspicion of grievous bodily harm and has since been released on police bail pending further enquiries.”
DS Gardiner added: ““This was a very serious incident and traumatic for the occupants of the house.
“I would appeal to anyone who witnessed the assault or anyone with any information which could assist us with our enquiries to contact detectives at Musgrave on 101 quoting reference number 714 10/09/17.
“Information can also be given anonymously through the independent charity Crimestoppers on 0800 555 111.”