This is one of a series designed to help teachers planning a site visit. Historical background is combined with a variety of possible study approaches, documentary sources and photocopiable activity sheets for classroom and on-site work, together with practical information about the site. This book focuses on Upnor Castle, which is still intact and is a 16th-century fort extended in the 17th century and built to defend the naval dockyards at Chatham. After the embarrassment of the Dutch raid up the Medway in 1667 it was turned into a gunpowder store and became the largest in England, even including the Tower of London.