During the Second World War, elements of the Royal Air Force had billets at Downhill House, while artillery batteries carried out training around Mussenden.
The Royal Air Force established billets in the once-grand Downhill House. The estate is in a prime location overlooking the North Atlantic Ocean but fell into disrepair following the Second World War.
Mussenden Temple stands in the grounds of Downhill Demesne, ever closer to the greatly eroded coastline. In wartime, artillery batteries used the area for training exercises.