A walker sustained a lower leg injury after they had slipped in mud on the riverside path along the River Derwent.
Emergency services were called by the group, who were downstream of Blanchland on Sunday.
Northumberland National Park Mountain Rescue Team (NNPMRT), North of Tyne Rescue Team and the North East Ambulance Service (NEAS) deployed crews to the scene at around 10.49am.
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Response vehicles were deployed and operational team members called out to rendezvous near Blanchland, Northumberland, where there was an access track down to the river and the footpath.
A spokesman for the NNPMRT said: "One of our duty controllers arrived on scene just ahead of the NEAS paramedics and was able to confirm the exact location and provide a list of required equipment.
"As soon as one of the response vehicles arrived at the RVP [rendezvous point], vital rescue equipment was carried to the incident site.
"Once the walker had received treatment by the paramedics and their injury had been immobilised, they were packaged on a Bell stretcher and wheel ready for the evacuation downstream towards Derwent Reservoir.
"After a 700m stretcher carry alongside the river and up a set of steep steps, the injured walker was handed over to the NEAS crewed ambulance for onward transport to hospital.
"Thank you to the walking group who cared for the injured party ahead of our arrival. We wish the injured walker well for a full recovery."
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