Fires on two open areas of Canford Heath overnight are believed to have been started deliberately.
Dorset & Wiltshire Fire and Rescue Service received its first call just after ten o’clock last night with crews from Poole, Redhill Park and Wimborne initially attending.
They quickly requested further support and, at the height of the incident, there were seven fire engines, two off-road vehicles, the Unimog and a water carrier.
Further crews attended from Wareham, Swanage, Sturminster Newton, Ferndown and Hamworthy.
Firefighters used compressed air foam and multiple hose reel jets to extinguish the fire.
Relief crews also attended from Bere Regis, Cranborne, Salisbury, Verwood and Blandford with remaining hotspots dampened down at three this morning using hose reel jets.
Dorset & Wiltshire Fire and Rescue Service said: “The cause is being investigated and believed to deliberate.
“Heath fires can occur at any time of year or time of day, and we advise everyone to remain vigilant.
“If you have any information about this incident, please contact the police or call Crimestoppers anonymously on 0800 555 111.”