The connection of a north Belfast mountain to World War II can still be seen today by the presence of a white stone.
In 1941, the Ministry of Defense commissioned a local postman to paint a large stone on the mountain white.
The stone, on Cave Hill, was used to help guide Allied pilots to the war airfields in Belfast at the time.
In recent times, a plaque has been defaced on the mountain to mark the war effort.
Activists call on members of the public to treat her and the surrounding mountain with respect.
Videojournalist: Niall McCracken