Police are searching for three men who broke into a house in a Lincoln village armed with weapons and attacked a 60-year-old man.
The offenders entered a home of a husband and wife in Main Street, Torksey via the rear door at around 9.30pm on August 26.
The man tried to fight off the offenders who had covered their faces and was attacked, suffering cuts to his head and hands. He was taken to hospital for treatment and remains there this morning.
The woman, 64, was not injured in the incident.
The offenders escaped with a quantity of cash, leaving the couple shocked and distressed.
Police are currently investigating the burglary and are appealing for witnesses and information.
Detective Inspector Steve Knubley said: “We are grateful for any information, no matter how insignificant it might seem. It could be that piece of information that we need to help find these offenders.
“I would like to make clear how rare this type of offence is. We have a duty to make our local communities aware and ask them to remain vigilant and call us with any information they think might be relevant, but also ask that people don’t worry unduly.
“I appreciate this will cause concern to members of the public but I would like to reiterate that this is an incredibly unusual offence which we believe is a one-off and isolated.
“I would also like to commend the victims involved in this. The gentleman showed incredible courage in standing up to these intruders in his home and thankfully was not seriously hurt.
“We wish him a speedy and full recovery and will be working with the couple to ensure they have the support and help they need.”
Anyone with information is asked to contact Lincolnshire Police on the non-emergency number 101 quoting incident 471 of August 26.
Alternatively contact the independent charity Crimestoppers anonymously on 0800 555 111.