Yarmouth Castle is an artillery fort built by Henry VIII in 1547 to protect Yarmouth Harbour on the Isle of Wight from the threat of French attack. Just under across, the square castle was initially equipped with 15 artillery guns and a garrison of 20 men. It featured an Italianate "arrow-head" bastion on its landward side; this was very different in style from the earlier circular bastions used in the Device Forts built by Henry and was the first of its kind to be constructed in England. During the 16th and 17th centuries the castle continued to be maintained and modified; the seaward half of the castle was turned into a solid gun platform and additional accommodation was built for the fort's gunners. A bulwark was built on the east side of the castle and an additional gun battery was placed on the town's quay, just to the west. For most of the English Civil War of the 1640s it was held by Parliament; following the Restoration, it was refortified by Charles II in the 1670s. The fortification remained in use through the 18th and 19th centuries, albeit with a smaller garrison and fewer guns, until in 1885 these were finally withdrawn. After a short period as a coast guard signalling post, the castle was brought back into military use during the First and Second World Wars. In the 21st century, the heritage organisation English Heritage operates the castle as a tourist attraction. History 16th century Construction Yarmouth Castle was built as a consequence of international tensions between England, France and the Holy Roman Empire in the final years of the reign of King Henry VIII. Traditionally the Crown had left coastal defences to the local lords and communities, only taking a small role in building and maintaining fortifications, and while France and the Empire remained in conflict with one another, maritime raids were common but an actual invasion of England seemed unlikely. Modest defences, based around simple blockhouses and towers, existed in the south-west and along the Sussex coast, with a few more impressive works in the north of England, but in general the fortifications were very limited in scale. In 1533, Henry broke with Pope Paul III to annul the long-standing marriage to his wife, Catherine of Aragon, and remarry. This resulted in France and the Empire declaring an alliance against Henry in 1538, and the Pope encouraged