Brownsea Castle the castle also has four cannons, probably dating from the 17th or early 18th century. The castle is protected under UK law as a Grade II listed building. Brownsea Castle Brownsea Castle, also known historically as Branksea Castle, was originally a Device Fort constructed by Henry VIII between 1545 and 1547 to protect Poole Harbour in Dorset, England, from the threat of French attack. Located on Brownsea Island, it comprised a stone blockhouse with a hexagonal gun platform. It was garrisoned by the local town with six soldiers and armed with eight artillery pieces. The castle remained in use after
Brownsea Island "Scouting for Boys", and the international Scouting movement grew rapidly. Boy Scouts continued to camp on the island until the 1930s, when all public access to the island was forbidden by the island's owner. After ownership of the island transferred to the National Trust, a permanent Scout camp site was opened in 1963 by Olave Baden-Powell. In August 2007, 100 years after the first experimental camp, Brownsea Island was the focus of worldwide celebrations of the centenary of Scouting. Four camps were set up on the island including a replica of the original 1907 camp, and hundreds of Scouts and