A crew from Ely was called to a fire in the open in Needingworth Road, Bluntisham.
A large bonfire was out of control and firefighters extinguished it using hose reels supplied by water using a light portable pump from open water.
The crew returned to their station by 1.25pm.
A CFRS spokesman said: “Bonfires can quickly become out of control and spread to houses, trees and fencing - especially when they’re left unattended. We would advise anyone to avoid having a bonfire and instead take material to a local waste and recycling site.
“If you do choose to have a bonfire, then ensure it is built well away from trees, foliage and other property. Pay attention to the weather, including wind direction, and never leave it unattended.”
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