Residents have been warned not to be alarmed as fire crews were despatched to Ickworth House near Bury St Edmunds.
Eight crews from across Suffolk were sent to the estate shortly after 6pm Wednesday, September 25, to conduct a fire-training exercise.
The 18th century house, built in an Italianate style, remains one of Suffolk's grandest tourist attractions.
Suffolk Fire and Rescue Service held the exercise inside the main house.
In a tweet, the fire service said: "We are simulating a fire in the main #ickworth house using our multi star aerial appliance as a water tower and supplying it with water from further in the house grounds.
"We would like to thank @IckworthNT for the opportunity to train tonight #practice #alwaysprepared."
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