Grass, fencing and bales were deliberately set alight in Wimblington on Saturday evening.
Fire crews from March arrived just after 7pm to tackle the fire on Blue Lane in Wimblington.
A fire service spokesman said: “We found a fire in the open involving grass, fencing and bales.
“We extinguished the fire using a hose reel and returned to our station by 8.45pm.”
The spokesman added: “The cause of the fire was deliberate.”
Anyone with information should contact police by visiting www.cambs.police.uk to submit an online report or call Crimestoppers on 0800 555111.
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