St Andrew's Castle

St Andrew’s Castle stands on Hamble Common beside Southampton Water in Hampshire. Henry VIII ordered its construction in 1542 as part of a chain of artillery forts designed to guard England against invasion. Built in just one year, it consisted of a stone keep and a curved gun platform facing the water, surrounded by a wide moat. The site had earlier been an Iron Age hillfort called Hamble Common Camp, traces of which lie nearby. Coastal erosion has since removed most of the masonry, leaving only fragments of walls and earthworks to mark its position. The castle’s brief but active life shows how quickly England’s defences were modernised in the 16th century. In 1559 it mounted nine heavy guns, including culverins and sakers, plus lighter hand weapons on the keep roof. William Paulet, later Marquess of Winchester, served as its captain and received an annual salary of £19. By 1577 the keeper was Simon Bowyer, a gentleman usher at court, who commanded a small garrison of gunners and soldiers. The fort remained in use until Parliament dismantled it in 1642 during the Civil War. Today the scheduled monument covers the remaining stonework and the surrounding common land. Visitors can walk the old moat line and see the low ruins of the keep and gun platform. The shoreline continues to retreat, so the visible remains change slowly over time. Hamble Common itself offers wide views across the Solent and towards Southampton Water, linking the site to its original purpose of defending the coast.