At 10.50am on Thursday (3) crews were called to a fire on South Brink in Wisbech.
Crews from Wisbech, March, Whittlesey and Huntingdon (including the Incident Command Unit) attended the scene.
Station Commander Mick Jackman, the officer in charge at the scene, said: “The crews arrived to find a well-developed fire involving two farm buildings. As with many buildings of this type, there was a significant amount of flammable material that was being stored in the area.
“The first crews to arrive took decisive actions to clear the area of the flammable material in addition to tackling the fire. This resulted in a larger area being safe enough to utilise more firefighters to contain and put out the fire.
“Without these decisive actions, one of the buildings would certainly have suffered significant and unrepairable damage.”
Ten firefighters wearing breathing apparatus used jets to extinguished the fire and ensure the area was clear of material and safe. Three casualties were treated for smoke inhalation at the scene and left in the care of ambulance crews.
The crews returned to their station by 2pm.
The cause of the fire was accidental.