Hurst Castle in Hampshire on the south coast of England is one of Henry VIII's Device Forts, built at the end of a long shingle spit at the west end of the Solent to guard the approaches to Southampton. Hurst Castle was sited at the narrow entrance to the Solent where the ebb and flow of the tides creates strong currents, putting would-be invaders at its mercy. Also known as a Henrician Castle, Hurst was built as part of Henry's chain of coastal defences to protect England during the turbulent times of his reign.