Six fire engines and 35 firefighters have put out a blaze in Thistlebrook, Abbey Wood that sent plumes of black smoke into the sky and could be seen for several miles in London.
Two static caravans have been badly damaged and the fire has also affected a bungalow.
London Fire Brigade control received 22 separate 999 calls.
National Police Air Service London provided helicopter aerial ‘eyes on’ and the London Ambulance Service were in attendance.
Nobody has been injured in the incident.
Gas cylinders at the scene had to be cooled down because of the danger of explosion.
Station Manager Winston Douglas in charge of the fire-fighting operation said:
We were faced with a fire affecting two large caravans and the heat has radiated to a nearby bungalow. People evacuated the nearby area before we arrived and there are no reports of any injuries. Fire crews led a horse to safety.
The Brigade was called at 3.15 pm and the fire was under control by two minutes past five.
Fire crews from Plumstead and surrounding stations were at the scene.
The cause of the fire is under investigation.