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The air ambulance landed in a park last night following reports of a stabbing.
A video shows the helicopter landing at the recreation ground in Faversham.
The night-time callout is believed to be in connection with a stabbing in the Church Road area.
Ground crews and police were also said to have been called to the incident.
A police spokesperson said: "Police were called to Church Road, Faversham at 10.48pm following a report of an assault.
"A man in his 40s suffered an injury consistent with a stab wound.
"He was taken by air ambulance to a London hospital for treatment and was later discharged.
"Enquiries are ongoing to establish the circumstances of the incident.
If anyone has any information that may assist officers with their investigation can call the witness appeal line on 01795 419119 quoting reference 46/129371/20.
You can also call Kent Crimestoppers, anonymously on 0800 555111.
The ambulance service has been contacted for comment.