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Many Napoleonic forts were built during the Napoleonic War in South East Cornwall to protect Plymouth Sound and Plymouth's docks in Devonport, Devon from attack: some are still in use today by the Ministry of Defence.
The First Sea Lord Jackie Fisher and Winston Churchill, First Lord of the Admiralty decided these should be used for two more monitors, initially M 13 and M 14, but then renamed after the French Napoleonic War marshals Nicolas Jean de Dieu Soult and Michel Ney.
Mass production using interchangeable parts was first achieved in 1803 by Marc Isambard Brunel in cooperation with Henry Maudslay, and Simon Goodrich, under the management of (with contributions by) Brigadier-General Sir Samuel Bentham the Inspector General of Naval Works at Portsmouth Block Mills at Portsmouth Dockyard for the British Royal Navy during the Napoleonic War.