In 1667 the Dutch sailed up the River Medway in Kent and unleashed a ferocious Dutch attack on the largest English naval ships, laid up Chatham Dockyard An intense battle ensued in which Upnor Castle played an important role, in its attempts to prevent the Dutch from completely destroying the English Naval Force.This book, written by a former 'Castle Custodian' not only explores this important battle in English naval history in depth but also guides the reader through this fantastic and changing fortress along the banks of the River Medway.